{"id":8033,"date":"2024-12-27T11:14:09","date_gmt":"2024-12-27T10:14:09","guid":{"rendered":"https:\/\/veterinarska-stanica-journal.hr\/?post_type=article&#038;p=8033"},"modified":"2025-06-06T19:02:27","modified_gmt":"2025-06-06T17:02:27","slug":"detection-of-bacteria-of-the-genus-salmonella-in-meat-from-northwest-croatia","status":"publish","type":"article","link":"https:\/\/journal.h3s.org\/?article=detection-of-bacteria-of-the-genus-salmonella-in-meat-from-northwest-croatia","title":{"rendered":"Detection of bacteria of the genus <em>Salmonella<\/em> in meat from northwest Croatia"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2024\/12\/VesnaJAKI-TKALEC-2024.jpg\" alt=\"VesnaJAKI-TKALEC-2024\" width=\"200\" height=\"250\" class=\"alignright size-full wp-image-8048\" \/><\/p>\n<p style=\"text-align: center;\">V. <strong>Jaki Tkalec<\/strong>, S. <strong>Furmeg<\/strong>*, M. <strong>Har\u010da<\/strong>, A. <strong>Humski<\/strong>, M. <strong>Beni\u0107<\/strong>, L. <strong>Cvetni\u0107<\/strong> and P. <strong>Stri\u010devi\u0107<\/strong><\/p>\n<hr \/>\n<div class=\"autorinfo\"><strong>Vesna JAKI TKALEC<\/strong>, DVM, PhD, Senior Research Associate, <strong>Sanja FURMEG<\/strong>*, Univ. Tehnical Spec. Aliment, (Corresponding author, e-mail: furmeg.vzk@veinst.hr), <strong>Matija HAR\u010cA<\/strong>, DVM, Expert Associate in Science, Croatian Veterinary institute \u2013 branch Veterinary institute Kri\u017eevci, Croatia; <strong>Andrea HUMSKI<\/strong>, DVM, PhD, Scientific Advisor, <strong>Miroslav BENI\u0106<\/strong>, DVM, PhD, Scientific Advisor with Tenure, <strong>Luka CVETNI\u0106<\/strong>, DVM, PhD, Research Associate, Croatian Veterinary institute, Zagreb, Croatia; <strong>Paula STRI\u010cEVI\u0106<\/strong>, DVM, Expert Associate in Science, Croatian Veterinary institute \u2013 branch Veterinary institute Kri\u017eevci, Croatia<\/div>\n<div class=\"doi\"><a href=\"https:\/\/veterinarska-stanica-journal.hr\/pdf\/56\/56-3\/detection-of-bacteria-of-the-genus-salmonella-in-meat-from-northwest-croatia.pdf\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2021\/03\/pdf.png\" alt=\"\" width=\"32\" height=\"18\" class=\"alignleft size-full wp-image-1504\" \/><\/a><a href=\"https:\/\/doi.org\/10.46419\/vs.56.3.11\" target=\"_blank\">https:\/\/doi.org\/10.46419\/vs.56.3.11<\/a><\/div>\n<\/p>\n<p><a name=\"menu\"><\/a><\/p>\n<div id=\"menu\">\n<div class=\"block grey mid\"><span class=\"small\"><a class=\"btn\" href=\"#Abstract\">Abstract<\/a><a class=\"btn\" href=\"#Introduction\">Introduction<\/a><a class=\"btn\" href=\"#Methods\">Methods<\/a><a class=\"btn\" href=\"#Results\">Results<\/a><a class=\"btn\" href=\"#Discussion\">Discussion<\/a><a class=\"btn\" href=\"#Conclusions\">Conclusions<\/a><a class=\"btn\" href=\"#Literatura1\" onclick=\"toggle_visibility('Literatura');\">References<\/a><a class=\"btn\" href=\"#Sazetak\">Sa\u017eetak<\/a><\/span><\/div>\n<\/div>\n<p><a name=\"Abstract\"><\/a><a class=\"alignright\" href=\"#\" onclick=\"scrollToTop();return false\"> &#9650;<\/a><\/p>\n<blockquote>\n<h2>Abstract<\/h2>\n<hr \/>\n<p>Salmonellosis is one of the most common food-borne zoonoses, and the most common source of infection for humans is meat and meat products. In 2023, 1125 samples of portioned meat (chicken, pork, beef) were tested in butcher shops in five counties of northern Croatia. The samples were tested for the presence of bacteria of the genus <em>Salmonella<\/em>, which were isolated in 88 (7.82%) samples. <em>Salmonella<\/em> was isolated from 69 of 604 (11.4%) chicken meat samples, from 10 of 319 (3.1%) pork samples and from 9 of 202 (4.5%) beef samples. Serological typing of chicken meat samples identified <em>S<\/em>. Infantis in 60 (87%) isolates, <em>S<\/em>. Mbandaka in six (8.7%), and <em>S<\/em>. Enteritidis in three (4.3%) samples. In pork, <em>S<\/em>. Derby was identified in two (20%) isolates, <em>S<\/em>. Typhimurium, <em>S<\/em>. Typhimurium (monophasic), <em>S<\/em>. London and <em>S<\/em>. Rissen in one isolate each (10%). In beef, <em>S<\/em>. Bovismorbificans was detected in five (55.6%) and <em>S<\/em>. Muenster in one (11.1%) isolate. Salmonellosis can be an economic problem due to the damage it causes in intensive production, but also a significant public health challenge as it spreads through the environment via consumption and the handling of contaminated meat in slaughterhouses, food processing and retail facilities.<br \/>\nThe implementation of appropriate hygiene measures and good hygiene practices from farms and slaughterhouses to butchers could help to reduce the contamination of meat with bacteria of the genus <em>Salmonella<\/em>.<\/p>\n<p><strong>Key words:<\/strong> <em>salmonellosis; meat; food safety; Salmonella; serovar<\/em><\/p><\/blockquote>\n<p><a name=\"Introduction\"><\/a><a class=\"alignright\" href=\"#menu\"> &#9650;<\/a><\/p>\n<h2>Introduction<\/h2>\n<hr \/>\n<p>Among food-borne zoonoses, salmonellosis is one of the most frequently reported zoonoses in the European Union.<br \/>\nIt is caused by bacteria of the genus <em>Salmonella<\/em>, which have been shown to occur in all species of mammals, birds, fish, reptiles, amphibians and invertebrates.<\/p>\n<p>Humans most commonly become infected through contaminated food, often due to poor hygiene practices, direct and indirect contact with pets such as dogs, cats and reptiles and their environment, and infected animals (Wibisono <em>et al<\/em>., 2020).<\/p>\n<p>The consumption of food and water contaminated with <em>Salmonella<\/em> can lead to illness. The main sources of infection for humans are contaminated meat and meat products, eggs, raw milk and products made from raw milk, fish and seafood, chocolate and other sweets, and fruit and vegetables, especially leafy vegetables (Andino and Hanning, 2015; Fischerstr\u00f6m <em>et al<\/em>., 2023). Contamination of meat can occur in slaughterhouses after slaughter during evisceration, through intestinal contents, in meat processing plants, and in butcheries through cross-contamination (Manfreda <em>et al<\/em>., 2014). The pathogen can survive for months under unfavorable conditions, as it is able to form biofilms consisting of several bacterial species that protect it from unfavorable environmental influences (Chen <em>et al<\/em>., 2024). Different <em>Salmonella<\/em> species are widely distributed in the environment and in the physiological microflora of numerous organisms. Within two species, there are many subspecies and serovars.<\/p>\n<p>A total of 46 O and 114 H antigens have been identified, which are labeled with numbers and letters and whose combinations give the antigenic formula of the different serovars (Brenner <em>et al<\/em>., 2000; Issenhuth-Jeanjean <em>et al<\/em>., 2014). They can be categorized into several groups based on their ability to infect and their pathogenicity to specific hosts. Those that cause infection in a wide range of hosts differ genetically through changes in virulence plasmids and chromosomal rearrangements, leading to various clinical manifestations (Connor and Schwartz, 2005; Silva <em>et al<\/em>., 2014; Soliani <em>et al<\/em>., 2023).<br \/>\nThey are highly adaptable and increasing antimicrobial resistance has been observed, causing enormous economic damage and representing one of the most common public health threats related to food production (Antunes <em>et al<\/em>., 2016).<\/p>\n<p>Figueiredo <em>et al<\/em>. (2015) described antibiotic resistance in <em>Salmonella<\/em>, with over 70% of the samples analysed resistant to at least one antibiotic. Monophasic <em>S<\/em>. Typhimurium and <em>S<\/em>. Infantis show exceptionally high resistance to several types of drugs. Virulence plasmids play a crucial role as they contain genes associated with antibiotic resistance and virulence factors, such as spvB (ADP-ribosylating toxin) and spvC (which inhibits pyroptosis and inflammation). It is important to note that serotypes with higher prevalence are more likely to develop resistance to commonly prescribed antibiotics.<br \/>\n<em>Salmonella<\/em> is a highly virulent pathogen and the presence of bacteria at 10 CFU\/ml poses a risk (Lamichhane <em>et al<\/em>., 2024).<\/p>\n<p><em>Salmonella<\/em> strains, which cause disease in a wide range of hosts, are genetically more diverse and lead to different clinical manifestations (Silva <em>et al<\/em>., 2014). In 2022, 65,208 cases of human salmonellosis were confirmed in the European Union Member States, corresponds to a reporting rate of 15.3% per 100,000 inhabitants. The five most frequently reported serovars causing salmonellosis in humans are <em>S<\/em>. Enteritidis (67.3%), <em>S<\/em>. Typhimurium (13.1%), monophasic <em>S<\/em>. Typhimurium (4.3%), <em>S<\/em>. Infantis (2.3%) and <em>S<\/em>. Derby (0.89%). In Croatia, 1,047 (21.7%) cases of human salmonellosis were confirmed in 2022 (EFSA, 2023).<\/p>\n<p>To prevent the zoonotic transmission of <em>Salmonella<\/em>, national <em>Salmonella<\/em> control programmes are implemented in European countries. In Croatia, there are annual monitoring programs for <em>Salmonella<\/em> in poultry flocks (laying hens, chicks and turkeys), and carcasses of pigs, cattle and sheep are tested in slaughterhouses, as are neck skins of chicken carcasses, meat products, meat preparations and minced meat. In addition, food producers have defined criteria for <em>Salmonella<\/em> in their HACCP plans.<\/p>\n<p>Despite all these efforts, this disease persists. The aim of this study was to determine the prevalence of contamination of portioned meat and small pieces of meat with <em>Salmonella<\/em> bacteria and the frequency of certain serovars in five counties in northern Croatia.<\/p>\n<p><a name=\"Methods\"><\/a><a class=\"alignright\" href=\"#menu\"> &#9650;<\/a><\/p>\n<h2>Methods<\/h2>\n<hr \/>\n<p>In 2023, 1125 samples of chicken, pork and beef categorised as portioned meat and small pieces of meat were collected in butcheries in Me\u0111imurje, Vara\u017edin, Koprivnica-Kri\u017eevci, Bjelovar-Bilogora and Zagreb Counties, and tested in the laboratory for the presence of <em>Salmonella<\/em> bacteria. The meat was sampled at the butcher\u2019s shops before the expiry date, and samples were transported in portable coolers under controlled conditions to maintain the cold chain to the Laboratory of Food and Feed Microbiology of the Veterinary Institute in Kri\u017eevci, where testing began immediately.<\/p>\n<h3>Isolation of <em>Salmonella<\/em> Bacteria<\/h3>\n<p>For the isolation of <em>Salmonella<\/em> bacteria, the method according to the standard HRN EN ISO 6579-1:2017; HRN EN ISO 6579-1:2017\/A1:2020 was used. The test sample consisted of 25 g meat diluted with 225 mL buffered peptone water (Biokar, France). MkTTn (Biokar, France) and RVS (Oxoid, UK) broths were used for selective enrichment and two selective media were used for <em>Salmonella<\/em> growth: XLD (Biokar, France) and RAMBACH agar (Merck, Germany). After incubation for 24 hours at 37\u00b0C, <em>Salmonella<\/em> colonies on XLD agar show a black center and a slightly transparent reddish zone due to the color change of the indicator, while they appear red on Rambach agar. Colonies grown on XLD and Rambach agar were subcultured on neutral nutrient agar (Merck, Germany).<\/p>\n<h3>Identification of Bacteria<\/h3>\n<p>Confirmatory tests for the identification of <em>Salmonella<\/em> included TSI agar (Merck, Germany), Gram staining, oxidase test (Merck, Germany) and biochemical identification using the automated Vitek2 Compact system (bioMerieux, France) with the Vitek2 ID GN identification card. A pure culture grown on neutral agar was transferred with a sterile swab into a sterile solution (0.45-0.50% NaCl, pH 4.5-7.0) to obtain a bacterial suspension with an optical density of 0.50 to 0.63 according to McFarland. Colorimetric cards for the identification of Gram-negative bacteria (bioMerieux, France) containing the tests shown in Table 1 were used for the identification of <em>Salmonella<\/em>.<\/p>\n<figure id=\"attachment_8040\" aria-describedby=\"caption-attachment-8040\" style=\"width: 654px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2024\/12\/Table01-Detection.png\" alt=\"Table01-Detection\" width=\"654\" height=\"257\" class=\"size-full wp-image-8040\" srcset=\"https:\/\/journal.h3s.org\/wp-content\/uploads\/2024\/12\/Table01-Detection.png 654w, https:\/\/journal.h3s.org\/wp-content\/uploads\/2024\/12\/Table01-Detection-300x118.png 300w\" sizes=\"auto, (max-width: 654px) 100vw, 654px\" \/><figcaption id=\"caption-attachment-8040\" class=\"wp-caption-text\"><strong>Table 1<\/strong>. Overview of biochemical tests in the VITEK2 system in the case of confirmed presence of <em>Salmonella<\/em> spp.<\/figcaption><\/figure>\n<p>The results of the biochemical tests with the VITEK2 system were reported at the end of the measurements with the percentage of certainty of identification.<br \/>\nPolyvalent and monovalent sera (SSI Diagnostica, Denmark) were used for serological confirmation and identification.<br \/>\nThe presence of <em>Salmonella<\/em> O<sup>&#8211;<\/sup>, H<sup>&#8211;<\/sup> and Viantigens was detected by agglutination of pure colonies using the rapid agglutination technique on a slide with the corresponding serums after elimination of auto-agglutinating strains. The nomenclature of serovars and the serological typing scheme were performed according to the White-Kauffmann-Le Minor scheme (Grimont and Weill, 2007). We used the software program Stata 13.1 (Stata Corp., USA) to analyse the numerical data collected in the study. The association between the frequency of <em>Salmonella<\/em> isolation and the type of meat was assessed using the chi-square test. The results of the statistical analysis were expressed as a probability (<em>P<\/em>-value), and values less than 0.05 were considered statistically significant.<\/p>\n<p><a name=\"Results\"><\/a><a class=\"alignright\" href=\"#menu\"> &#9650;<\/a><\/p>\n<h2>Results<\/h2>\n<hr \/>\n<p>During the study period, 1125 meat samples were processed: 604 chicken, 319 pork and 202 beef samples. <em>Salmonella<\/em> bacteria were isolated from 88 (7.8%) of the total processed samples (Table 2).<\/p>\n<figure id=\"attachment_8041\" aria-describedby=\"caption-attachment-8041\" style=\"width: 654px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2024\/12\/Table02-Detection.png\" alt=\"Table02-Detection\" width=\"654\" height=\"356\" class=\"size-full wp-image-8041\" srcset=\"https:\/\/journal.h3s.org\/wp-content\/uploads\/2024\/12\/Table02-Detection.png 654w, https:\/\/journal.h3s.org\/wp-content\/uploads\/2024\/12\/Table02-Detection-300x163.png 300w\" sizes=\"auto, (max-width: 654px) 100vw, 654px\" \/><figcaption id=\"caption-attachment-8041\" class=\"wp-caption-text\"><strong>Table 2<\/strong>. Number of Processed Samples and Samples with <em>Salmonella<\/em>.<\/figcaption><\/figure>\n<p>The highest number was isolated from chicken meat, with 69 (11.4%) samples, followed by 10 (3.1%) samples of pork and nine (4.5%) samples of beef. Serological typing identified <em>S<\/em>. Infantis in 60 (87%), <em>S<\/em>. Mbandaka in six (8.7%) and <em>S<\/em>. Enteritidis in three (4.3%) isolated samples of chicken meat. In pork, <em>S<\/em>. Derby was identified in two (20%) isolates, while <em>S<\/em>. Typhimurium, monophasic variant (1,4 [5],12\u2227-), <em>S<\/em>. London and <em>S<\/em>. Rissen were identified in one (10%) isolate each. In beef, <em>S<\/em>. Bovismorbificans was identified in five (55.6%) isolates and <em>S<\/em>. Muenster (11.1%) in one isolate. Four isolates from pork and three isolates from beef were biochemically confirmed to the genus level but not serologically typed to the species level. The correlation between the frequency of <em>Salmonella<\/em> isolation and the type of meat was determined using the chi-square test. The frequency of isolation of <em>Salmonella<\/em> bacteria was highest in portioned chicken meat (11.42%) and lowest in portioned pork (3.13%). The observed differences in the frequency of <em>Salmonella<\/em> isolation from portioned meat and small pieces of meat from different animal species were statistically significant (<em>P<\/em>&lt;0.001).<\/p>\n<p><a name=\"Discussion\"><\/a><a class=\"alignright\" href=\"#menu\"> &#9650;<\/a><\/p>\n<h2>Discussion<\/h2>\n<hr \/>\n<p>In this study, 1125 meat samples were processed, and <em>Salmonella<\/em> bacteria were isolated from 88 (7.82%) of samples. In chicken meat samples, <em>Salmonella<\/em> was found in 11.4% of the samples, with the serovar <em>S<\/em>. Infantis confirmed in 87% of isolated strains, followed by <em>S<\/em>. Mbandaka in 8.7% and <em>S<\/em>. Enteritidis in 4.3% of the isolates. The results of this study indicate an increase in the prevalence of <em>Salmonella<\/em> in chicken meat compared to previous periods. Liste\u0161 <em>et al<\/em>. (2013) detected <em>Salmonella<\/em> spp. in 8.3% of poultry meat samples in Dalmatia from 2007 to 2009, 4.5% in meat preparations, 3.4% in slaughter meat, 2.2% in processed meat and 0.1% in portioned meat and meat preparations.<br \/>\nThe most frequently occurring serovars were <em>S<\/em>. Typhimurium, <em>S<\/em>. Enteritidis, <em>S<\/em>. Montevideo, <em>S<\/em>. Tennessee and others, with 19 different serovars typed. Jaki Tkalec <em>et al<\/em>. (2021) concluded that the prevalence of <em>Salmonella<\/em> in chicken meat from farms in northern Croatia was 5.5% from 2016 to 2020. In 2016, it was found in 6% of the samples tested, in 2017 in 4.7%, in 2018 in 6.1%, in 2019 in 6.6% and in 2020 in 5.4% of the samples. In serological typing, <em>S<\/em>. Infantis was identified in 63.2% of the isolated strains, making it the most frequently confirmed serovar in all years.<br \/>\n<em>S<\/em>. Typhimurium was isolated in 5.9% of the strains, <em>S<\/em>. Enteritidis in 2.2% and <em>S<\/em>. Mbandaka in 0.7% of isolated strains, together with 12 other serovars. Hengl <em>et al<\/em>. (2016) found that the prevalence in Croatia was higher at 10.5%, based on a study of 474 chicken meat samples and products collected during official hygiene inspections. The most common serovar was <em>S<\/em>. Infantis, with other serovars such as <em>S<\/em>. Thompson, <em>S<\/em>. Enteritidis, <em>S<\/em>. Typhimurium and <em>S<\/em>. Agona identified. In Eastern Croatia, the presence of <em>S<\/em>. Infantis was detected in 14.8% of 837 samples of portioned chicken meat (Perkovi\u0107 <em>et al<\/em>., 2021), which represents a slightly higher prevalence compared to our results. Pate <em>et al<\/em>. (2019) showed a prevalence of 28.4% for <em>Salmonella<\/em> in fresh broiler meat and 26.7% in meat preparations from broilers in Slovenia, with <em>S<\/em>. Infantis detected in 4.5% of samples. According to the EFSA Annual Report 2022, fresh chicken meat and chicken products continue to be the category in which <em>Salmonella<\/em> is most frequently detected, and <em>S<\/em>. Infantis is the most prevalent serovar. It is believed that the vaccination of poultry with the serovars <em>S<\/em>. Typhimurium and <em>S<\/em>. Enteritidis has led to an increase in <em>S<\/em>. Infantis, which has occupied an ecological niche and now dominates poultry farms in the EU (Andino and Hanning, 2015). Despite the implementation of all hygiene measures during the plant closure period, this pathogen remains present on certain farms (Pate <em>et al<\/em>., 2019).<\/p>\n<p>Pork is one of the most commonly consumed meats in the European Union, and <em>Salmonella<\/em> is one of the major biohazards in pork, especially the serovar Typhimurium, including its monophasic variant worldwide. <em>Salmonella<\/em> is commonly found in the tonsils, intestines, mesenteric lymph nodes and parotid glands and spreads to the carcasses of pigs during slaughter processing, as well as to the entire production line, equipment, knives and workers (Salines <em>et al<\/em>., 2023). During the study, <em>Salmonella<\/em> was detected in 3.1% of pork samples, and serotyping identified <em>S<\/em>. Derby in 20% of isolates, <em>S<\/em>. Typhimurium, <em>S<\/em>. Typhimurium (monophasic), <em>S<\/em>. London and <em>S<\/em>. Rissen in 10% of isolated strains. The results of a study carried out in seven abattoirs in southern Germany on various pork samples (e.g., carcasses, livers, kidneys, tongues, hearts, lungs) showed a <em>Salmonella<\/em> prevalence of 1.1% (Meyer <em>et al<\/em>., 2010). The highest percentage of samples testing positive for <em>Salmonella<\/em> by isolation was found in pork tongues (5.0%), suggesting that tongues can be a source of cross-contamination of meat when consumed undercooked. In the same study, <em>Salmonella<\/em> was isolated from 17 of 1569 pig carcasses (1.1%). A high prevalence was reported in Belgium (37%), where it was concluded that the high contamination of carcasses after slaughter was due to the delivery of pigs positive for <em>Salmonella<\/em>, accidental spillage of caecal contents, mainly feces, during evisceration and cross-contamination from the slaughterhouse environment (Botteldoorn, 2003). Deane <em>et al<\/em>. (2022) isolated <em>Salmonella<\/em> from swab samples of pig carcasses in 11.5% of samples and in lymph nodes in 31.7%.<br \/>\n<em>S<\/em>. Typhimurium, including the monophasic variant, was the most frequently isolated serovar, found in 56% of isolates from swabs of carcasses and in 73% from lymph nodes. <em>S<\/em>. London and <em>S<\/em>. Derby were the next most frequently isolated serotypes. Contamination of carcasses with <em>Salmonella<\/em> is an important parameter to measure the effectiveness of hygiene criteria in slaughterhouses. These results confirm the persistently high levels of <em>Salmonella<\/em> in fattening pigs, and the high prevalence of <em>Salmonella<\/em> in lymph nodes indicates that <em>Salmonella<\/em> remains a significant problem in slaughter and hygiene compliance in slaughterhouses. In 2011, EFSA conducted a study in the EU Member States, Iceland and Norway, in which a total of 52,868 units of fresh pork were tested, with 0.7% testing positive for Salm<em>Salmonella<\/em>onella (EFSA, 2013). A study on the prevalence and diversity of <em>S<\/em>. Enterica serovars in animal-derived foods (beef, pork, poultry and seafood) on five continents (Africa, North and Latin America, Asia, Europe and Oceania) shows that the serovar Typhimurium is ubiquitous on all continents, with Africa and Europe leading the way (Ferrari <em>et al<\/em>., 2019).<\/p>\n<p>In our analysis of beef samples, <em>Salmonella<\/em> was found in 4.5% of the samples tested. Among the serovars isolated, <em>S<\/em>. Bovismorbificans was confirmed in 55.6% and <em>S<\/em>. Muenster in 11.1% of isolates. In the USA, most <em>Salmonella<\/em> outbreaks were caused by ground beef prepared at home, and studies show that one-third of Americans do not use safe food handling practices to avoid cross-contamination in the kitchen (Laufer <em>et al<\/em>., 2015). Bosilevac <em>et al<\/em>. (2008) found a prevalence of 4.2% in ground beef from seven regions of the USA, which is very similar to our results.<br \/>\nThe most frequently isolated serotypes were <em>S<\/em>. Anatum, <em>S<\/em>. Mbandaka, <em>S<\/em>. Montevideo and <em>S<\/em>. Muenster, which accounted for 50% of the isolates. Meyer <em>et al<\/em>. (2010) found <em>Salmonella<\/em> in only one sample (0.1%) in a study of 1366 samples of beef (swabs, carcasses, liver, kidney, tongue, heart, lung). The most common serovars in cattle are <em>S<\/em>. Typhimurium and <em>S<\/em>. Dublin, in pigs they are <em>S<\/em>. Typhimurium (monophasic), <em>S<\/em>. Derby and <em>S<\/em>. Typhimurium. In broilers, the most common serovars are <em>S<\/em>. Infantis, <em>S<\/em>. Enteritidis and <em>S<\/em>. Mbandaka. In the EU, <em>S<\/em>. Enteritidis, <em>S<\/em>. Typhimurium and monophasic <em>S<\/em>. Typhimurium are the most common causes of salmonellosis in humans. In fresh meat, the highest number of positive samples was found in broiler meat, which is understandable considering that national <em>Salmonella<\/em> control programmes are implemented in the EU for the poultry population to reduce <em>Salmonella<\/em>, while there is no coordinated approach between EU Member States for other animal species.<br \/>\nComparing the number of reported cases of salmonellosis caused by the consumption of food contaminated with <em>Salmonella<\/em> in 2022, a slight increase was observed in Croatia and the EU compared to 2021 and 2020. The proportion of monophasic <em>S<\/em>. Typhimurium has slightly increased, while the proportion of <em>S<\/em>. Enteritidis has decreased compared to previous years, when this strain was in second place in Europe and third place in the USA. This could be due to the continuation of everyday activities (social events, visits to the doctor, travel) after the restrictions due to the COVID-19 pandemic (EFSA, 2023).<\/p>\n<p><a name=\"Conclusions\"><\/a><a class=\"alignright\" href=\"#menu\"> &#9650;<\/a><\/p>\n<h2>Conclusions<\/h2>\n<hr \/>\n<p>This research, which revealed the presence of <em>Salmonella<\/em> bacteria at a level of 11.4% in chicken meat, 3.1% in pork and 4.5% in beef from butcher shops in northwest Croatia, indicates an increase in the incidence of <em>Salmonella<\/em>. <em>Salmonella<\/em> spp. has always been a global public health concern as it can be transmitted to humans through consumption and spread in the environment when handling contaminated meat in slaughterhouses, processing plants and households. The emergence of antibiotic resistance in <em>Salmonella<\/em> poses a major challenge in the treatment of <em>Salmonella<\/em> infections, as it often leads to treatment failures and associated costs. Salmonellosis is also a significant economic problem as it damages livestock production. It is important to identify the factors that contribute to the spread of this pathogen in meat production in order to reduce the risk of salmonellosis cases in humans. Therefore, monitoring for pathogens in fresh meat and products at the end of the production chain is crucial. The implementation of appropriate hygiene measures and good hygiene practices from farms and slaughterhouses to butchers could help to reduce <em>Salmonella<\/em> contamination.<\/p>\n<p><a name=\"Literatura1\"><\/a><br \/>\n<strong>References<\/strong><span style=\"color: #808080;\"><a onclick=\"toggle_visibility('Literatura');\" ><span style=\"color: #808080; cursor:pointer;\"> [&#8230; show]<\/span><\/a><\/span><\/p>\n<div id=\"Literatura\" style=\"display: none;\">&nbsp;<a class=\"alignright\" href=\"#menu\" onclick=\"toggle_visibility('Literatura');\"> &#9650;<\/a><\/p>\n<p style=\"font-size: small;\"><em>1.\tANDINO, A. and I. HANNING (2015): Salmonella enterica: Survival, Colonization, and Virulence Differences among Serovars. The Scientific World Journal, ID 520179. 10.1155\/2015\/520179.<br \/>\n2.\tANTUNES, P., J. MOURAO, J. CAMPOS and L. PEIXE (2016): Salmonellosis: the role of poultry meat. Clin. Microbiol. Infect. 22, 110-121. 10.1016\/j.cmi.2015.<br \/>\n3.\tBOSILEVAC, J. M., M. N. GUERINI, N. KALCHAYANAND and M. KOOHMARAIE (2008): Prevalence and Characterization of Salmonellae in Commercial Ground Beef in the United States. Appl. Environ. Microbiol. 75, 1892-1900. 10.1128\/AEM.02530-08.<br \/>\n4.\tBOTTELDOORN, N., M. HEYNDRICKX, N. RIJPENS, K. GRIJSPEERDT and L. HERMAN (2003): Salmonella on pig carcasses: positive pigs and cross contamination in the slaughterhouse. J. Appl. Microbiol. 95, 891-903. 10.1046\/j.1365-2672.2003.02042.<br \/>\n5.\tBRENNER, F. W., R. G. VILLAR, F. J. ANGULO, R. TAUXE and B. SWAMINATHAN (2000): Salmonella Nomenclature. J. Clin. Microbiol. 38, 2465-2467. 10.1128\/JCM.38.7.2465-2467.2000.<br \/>\n6.\tCHEN, Q., V. PALANISAMY, R. WANG, J. M. BOSILEVAC and S. CHITLAPILLY DASS (2024): Salmonella \u2013 induced microbiome profile in response to sanitation by quaternary ammonium chloride. Microbiol. Spectr. 12 (2). 10.1128\/spectrum. 02346-23.<br \/>\n7.\tCONNOR, B. A. and E. SCHWARTZ (2005): Typhoid and paratyphoid fever in travelers. The Lancet Inf Dis. 5, 623-628.<br \/>\n8.\tDEANE, A., D. MURPHY, F. C. LEONARD, W. BYRNE, T. CLEGG, G. MADIGAN, M. GRIFFIN, J. EGAN and D. M. PRENDERGAST (2022): Prevalence of Salmonella spp. in slaughter pigs and carcasses in Irish abattoirs and their antimicrobial resistance. Irish Vet. J. 75:4. 10.1186\/s13620-022-00211-y.<br \/>\n9.\tEFSA (2023): The European Union One Health Zoonoses Report 2022. Salmonella in the EU, 2022. EFSA Journal 2022; 20 (12):7666.<br \/>\n10.\tEFSA (2013): The European Union Summary Report on Trends and Sources of Zoonoses, Zoonotic Agents and Food-borne Outbreaks in 2011. EFSA Journal 2013;11(4):3129.<br \/>\n11.\tFERRARI, R. G., D. K. A. ROSARIO, A. CUNHA \u2013 NETO, S. B. MANO, E. E. S. FIGUEIREDO and C. A. CONTE \u2013 JUNIOR (2019): Worlwide Epidemiology of Salmonella Serovars in Animal-Based Foods: Meta \u2013 analysis. Appl. Environ. Microbiol. 85: e00591-19. 10.1128\/AEM.00591-19.<br \/>\n12.\tFIGUEIREDO, R., R. CARD, C. NUNES, M. ABUOUN, M. C. BAGNALL, J. NUNEZ, N. MENDONCA, M. F. ANJUM and G. JORGE DA SILVA (2015): Virulence Characterization of Salmonella enterica by a New Microarray: Detection and Evaluation of the Cytolethal Distending Toxin Gene Activity in the Unusual Host S. Typhimurium. PloS ONE 10 (8). 10.1371\/journal.pone.0135010.<br \/>\n13.\tFISCHERSTR\u00d6M, K., R. DRYSELIUS, M. LINDBLAD, et al. (2023): Outbrake of Salmonella Typhimurium linked to Swedish pre-washed rocket salad, Sweden, September to November 2022. Euro Surveill, 2024; 29(10): pii=2300299. 10.2807\/1560-7917.ES.2024.29.10.2300299.<br \/>\n14.\tGRIMONT, P. A. D. and F. X. WEILL (2007): Antigenic Formulae of the Salmonella serovars. Institut Pasteur, 28 rue du Dr. Roux, 75724 Paris Cedex 15, France.<br \/>\n15.\tHENGL, B., B. A. GROSS \u2013 BO\u0160KOVI\u0106, K. VULJANI\u0106, A. M. CRNI\u0106, R. VAZDAR and J. PETRI\u0106 (2016): Salmonella Infantis in chicken meat available on the market in Croatia. Meso 18, 342-347.<br \/>\n16.\tHRN EN ISO 6579-1:2017 \u2013 Microbiology in the food chain \u2013 Horizontal method for the detection, enumeration, and serotyping of Salmonella \u2013 Part 1: Detection of Salmonella spp. Croatian Institute for Standards.<br \/>\n17.\tHRN EN ISO 6579-1:2017\/A1:2020 \u2013 Microbiology in the food chain \u2013 Horizontal method for the detection, enumeration, and serotyping of Salmonella \u2013 Part 1: Detection of Salmonella spp. \u2013 Amendment 1: Extension of the incubation temperature range, modification of the significance of supplement D, and correction of the composition of MSRV and SC. Croatian Institute for Standards.<br \/>\n18.\tISSENHUTH-JEANJEAN, S., P. ROGGENTIN, M. MIKOLEIT, M. GUIBOURDENCHE, E. de PINNA, S. NAIR, P. I. FIELDS and F. X. WEILL (2014): Supplement 2008-2010 (no. 48) to the White-Kauffmann-Le Minor scheme. Res. Microbiol. 165, 526-530. 10.1016\/j.resmic.2014.07.004.<br \/>\n19.\tJAKI TKALEC, V., S. FURMEG, M. BUKVI\u0106, M. CVETNI\u0106, J. SOKOLOVI\u0106, P. MUSTAPI\u0106, K. SOKOLI\u0106, M. MIKULI\u0106 and \u017d. CVETNI\u0106 (2021): The prevalence of Salmonella spp. serovars in chicken meat from the northwestern region of Croatia. Vet stn. 52, 387-396. 10.46419\/vs.52.4.11.<br \/>\n20.\tLAMICHHANE, B., A. S. S. MAWAD, M. SALEH, et al. (2024): Salmonellosis: An Overview of Epidemiology, Pathogenesis, and Innovative Approaches to Mitigate the Antimicrobial Resistant Infections. Antibiotics 13, 76. 10.3390\/antibiotics13010076.<br \/>\n21.\tLAUFER, A. S., J. GRASS, K. HOLT, J. M. WHICHARD, P. M. GRIFFIN and L. H. GOULD (2015): Outbreaks of Salmonella infections attributed to beef \u2013 United States, 1973-2011. Epidemiol. Infect. 143, 2003-2013. 10.1017\/S0950268814003112.<br \/>\n22.\tLISTE\u0160, I., I. \u0160KOKO, T. DUJI\u0106 and A. KATI\u0106 (2013): The prevalence of Salmonella serovars in food samples for humans and animals in the Dalmatia region during the period from 2007 to 2009. (Zagreb, 2013.). The 5th International Congress \u201cVeterinary Science and Profession\u201d, Book of abstracts VZS. Pp. 87-87.<br \/>\n23.\tMANFREDA, G., A. VALERO, D. RODRIGUEZ \u2013 LAZARO, M. HERNANDEZ, F. PASQUALI and A. DE CESARE (2014): Performance objectives for Salmonella in fresh pork meat intended to be eaten cooked: How to derive them and verify their achievement. Int J. Food Microbiol. 184, 55-59. 10.1016\/j.ijfoodmicro.2014.05.014.<br \/>\n24.\tMEYER, C., S. THIEL, U. ULLRICH and A. STOLLE (2010): Salmonella in Raw Meat and By-Products from Pork and Beef. J. Food Prot., 73, 1780-1784. 10.4315\/0362-028x-73.10.1780.<br \/>\n25.\tPATE, M., J. MI\u010cUNOVI\u010c, M. GOLOB, L. \u010c. VESTBY and M. OCEPEK (2019): Salmonella Infantis in broiler flock in Slovenia: The prevalence of multidrug resistant strains with high genetic homogeneity and low biofilm-forming ability. Biomed. Res. Int. ID 4981463. 10.1155\/2019\/4981463.<br \/>\n26.\tPERKOVI\u0106, I., M. KRAJINA, M. VUKI\u010cEVI\u0106, M. \u0160KRIVANKO and H. KRAJINA (2021): The occurrence of Salmonella spp. bacteria in chicken meat from the eastern region of Croatia. (Osijek, 2021). Book of Abstracts of the 13th International Scientific and Professional Conference WITH FOOD TO HEALTH. Pp. 107-107.<br \/>\n27.\tSALINES, M., T. LAZOU, J. GOMEZ-LUENGO, J. HOLTHE, I. NASTASIJEVIC, M. BOUWKNEGT, N. DADIOS, K. HOUF, B. BLAGOJEVIC and D. ANTIC (2023): Risk categorisation of abattoirs in Europe: Current state of play. Food control 152. 10.1016\/j.foodcont.2023.109863.<br \/>\n28.\tSILVA, C., E. CALVA and S. MALOY (2014): One Health and Food-Borne Disease: Salmonella Transmission between Humans, Animals, and Plants. Microbiol Spectr. 2(1): OH-0020-2013. 10.1128\/microbiolspec.<br \/>\n29.\tSOLIANI, L., G. RUGNA, A. PROSPERI, C. CHIAPPONI and A. LUPPI (2023): Salmonella Infection in Pigs: Disease, Prevalence, and a Link between Swine and Human Health. Pathogens. 12, 1267. 10.3390\/pathogens12101267.<br \/>\n30.\tWIBISONO, F. M., F. J. WIBISONO, M. H. EFFENDI, H. PLUMERIASTUTI, A. R. HIDAYATULLAH, E.B. HARTADI and E. D. SOFIANA (2020): A Review of Salmonellosis on Poultry Farms: Public Health Importance. Sys. Rev. Pharm: 11, 481-486. 10.31838\/srp.2020.9.69.<br \/>\n<\/em><\/p>\n<\/div>\n<p><a name=\"Sazetak\"><\/a><a class=\"alignright\" href=\"#\" onclick=\"scrollToTop();return false\"> &#9650;<\/a><\/p>\n<blockquote>\n<h2>Nalaz bakterija iz roda <em>Salmonella<\/em> u mesu s podru\u010dja sjeverozapadne Hrvatske<\/h2>\n<hr \/>\n<div class=\"info\">Dr. sc. <strong>Vesna JAKI TKALEC<\/strong>, dr. med. vet., vi\u0161a znanstvena suradnica, <strong>Sanja FURMEG<\/strong>, mag. sanit. ing., univ. spec. techn. aliment., <strong>Matija HAR\u010cA<\/strong>, dr. med. vet., stru\u010dni suradnik u sustavu znanosti, Hrvatski veterinarski institut, Veterinarski zavod Kri\u017eevci, Hrvatska; dr. sc. <strong>Andrea HUMSKI<\/strong>, dr. med. vet., znanstvena savjetnica, dr. sc. <strong>Miroslav BENI\u0106<\/strong>, dr. med. vet., znanstveni savjetnik u trajnom izboru, dr. sc. <strong>Luka CVETNI\u0106<\/strong>, dr. med. vet., znanstveni suradnik, Hrvatski veterinarski institut, Zagreb, Hrvatska; <strong>Paula STRI\u010cEVI\u0106<\/strong>, dr. med. vet., stru\u010dna suradnica u sustavu znanosti, Hrvatski veterinarski institut, Veterinarski zavod Kri\u017eevci, Hrvatska<\/div>\n<hr \/>\n<p>Salmoneloza je jedna od naju\u010destalijih zoonoza koja se prenosi hranom, a naj\u010de\u0161\u0107i izvor zaraze za ljude je meso i proizvodi od mesa. Tijekom 2023. godine uzorkovano je 1125 uzoraka porcioniranog mesa (pile\u0107e, svinjsko, june\u0107e) u mesnicama na podru\u010dju pet \u017eupanija sjeverne Hrvatske. Uzorci su pretra\u017eeni na prisustvo bakterija iz roda <em>Salmonella<\/em> koje su izdvojene u 88 (7,82 %) uzoraka. Od 604 uzoraka pile\u0107eg mesa salmonele su izdvojene u 69 (11,4 %) uzoraka, od 319 uzoraka svinjskog mesa u 10 (3,1 %) uzoraka i od 202 uzorka june\u0107eg mesa u 9 (4,5 %) uzoraka. Serolo\u0161kom tipizacijom <em>S<\/em>. Infantis je identificirana u 60 (87 %) izolata iz uzoraka pile\u0107eg mesa, <em>S<\/em>. Mbandaka u 6 (8,7 %), a <em>S<\/em>. Enteritidis u 3 (4,3 %). Iz svinjskog mesa <em>S<\/em>. Derby identificirana je u 2 (20%) izolata, <em>S<\/em>. Typhimurim, <em>S<\/em>. Typhimurium (monofazna), <em>S<\/em>. London i <em>S<\/em>. Rissen u po jednom (10 %) izdvojenom izolatu. Iz june\u0107eg mesa identificirane su <em>S<\/em>. Bovismorbificans u 5 (55,6 %) i <em>S<\/em>. Muenster u jednom (11,1 %) izolatu. Salmoneloza mo\u017ee predstavljati gospodarski problem zbog \u0161teta koje nanosi u intenzivnoj proizvodnji, ali i znatan javnozdravstveni izazov jer se konzumacijom i manipulacijom kontaminiranog mesa \u0161iri na okoli\u0161 u klaonicama, objektima prerade i prodaje hrane. Provedbom odgovaraju\u0107ih higijenskih mjera i dobre higijenske prakse od farmi i klaonica do mesnica moglo bi se doprinijeti manjoj kontaminaciji mesa bakterijama iz roda <em>Salmonella<\/em>.<\/p>\n<p><strong>Klju\u010dne rije\u010di:<\/strong> <em>salmoneloza, meso, sigurnost hrane, Salmonella, serovar<\/em><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>V. Jaki Tkalec, S. Furmeg*, M. Har\u010da, A. Humski, M. Beni\u0107, L. Cvetni\u0107 and P. Stri\u010devi\u0107 Vesna JAKI TKALEC, DVM,<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":12,"comment_status":"closed","ping_status":"open","template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[1965,1990,467,2424,2425],"issuem_issue":[2423],"ppma_author":[128,292,1039,700,801],"class_list":["post-8033","article","type-article","status-publish","format-standard","hentry","category-original-scientific-articles","tag-food-safety","tag-meat","tag-salmonella","tag-salmonellosis","tag-serovar","issuem_issue-veterinarska-stanica-56-3"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Detection of bacteria of the genus Salmonella in meat from northwest Croatia - CROATIAN VETERINARY JOURNAL<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/journal.h3s.org\/?article=detection-of-bacteria-of-the-genus-salmonella-in-meat-from-northwest-croatia\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Detection of bacteria of the genus Salmonella in meat from northwest Croatia - CROATIAN VETERINARY JOURNAL\" \/>\n<meta property=\"og:description\" content=\"V. 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