Wild Boar : A Reservoir of Foodborne Zoonoses

Wild boar populations around the world have increased dramatically over past decades. Climate change, generating milder winters with less snow, may affect their spread into northern regions. Wild boars can serve as reservoirs for a number of bacteria, viruses, and parasites, which are transmissible to humans and domestic animals through direct interaction with wild boars, through contaminated food or indirectly through contaminated environment. Disease transmission between wild boars, domestic animals, and humans is an increasing threat to human and animal health, especially in areas with high wild boar densities. This article reviews important foodborne zoonoses, including bacterial diseases (brucellosis, salmonellosis, tuberculosis, and yersiniosis), parasitic diseases (toxoplasmosis and trichinellosis), and the viral hepatitis E. The focus is on the prevalence of these diseases and the causative microbes in wild boars. The role of wild boars in transmitting these pathogens to humans and livestock is also briefly discussed.Peer reviewe

Luonnonvarainen villisika - elintarviketurvallisuusriski?

Vertaisarvioitu.Luonnonvaraisten villisikojen määrä on viime vuosina lisääntynyt rajusti useassa Euroopan maassa, myös Suomessa. Villisiat ovat osoittautuneet useiden zoonoottisten taudinaiheuttajien eläinvarastoksi, reservoaariksi. Villisikakannan suurentuessa lisääntyy myös todennäköisyys, että niissä esiintyvät taudinaiheuttajat leviävät ihmisiin, eläimiin ja ympäristöön. Leviäminen voi tapahtua suoraan eritteiden kautta tai epäsuorasti saastuneen lihan välityksellä. Tärkeimpiin villisian lihan välityksellä leviäviin zoonooseihin lukeutuvat salmonelloosi, yersinioosi, toksoplasmoosi, trikinelloosi ja E-hepatiitti. Lisääntynyt metsästys ja luonnonvaraisen villisian lihan kulutus voivat altistaa kuluttajat villisianlihavälitteisille taudinaiheuttajille. Metsästäjien ja heidän perheenjäsentensä tartuntariski on suurin, sillä he käsittelevät ja kuluttavat suurimman osan kotimaisesta villisian lihasta. Tartuntariskiä voidaan vähentää hyvällä metsästys-, teurastus- ja käsittelyhygienialla sekä välttämällä raa'an tai riittämättömästi kypsennetyn villisian lihan syöntiä.Peer reviewe

Comparison of commercial ELISA tests for the detection of Toxoplasma antibodies in the meat juice of naturally infected pigs

Toxoplasmosis is a globally distributed protozoal zoonosis. Pigs are considered an important reservoir of Toxoplasma gondii and pork a major infection source of human toxoplasmosis. ELISA methods are commonly used diagnostic tools for detecting Toxoplasma infections. They are also used for slaughterhouse-based serological monitoring of toxoplasmosis in pigs to identify positive farms. The methods used are non-standardised with varying sensitivity and specificity. In our study, four commercial ELISA tests for the detection of Toxoplasma antibodies in the meat juice of slaughter pigs were compared with a modified agglutination test (MAT) as a reference. The cut-off values of the ELISA tests provided by the manufacturer varied between 0.20 and 0.50, and clearly influenced prevalence. The sensitivity of tests I, II and III varied between 96.4 and 78.6. Sensitivity was unacceptably low (3.6) for test IV (cut-off=0.30). Tests I, II and III had the highest accuracy and the best agreement with the reference test when a cut-off of 0.30 was used. Test II and III showed very good agreement (K=0.92 and 0.84, respectively) with the MAT. A very strong correlation (Pearson correlation >0.89) was observed between the S/P values of tests I, II and III. Our results demonstrate that the test and cut-off value used influence the results of the apparent seroprevalence studies. (C) 2017 Elsevier B.V. All rights reserved.Peer reviewe

Developing official control in slaughterhouses through internal audits

In the European Union, competent authorities are obligated to arrange audits to ensure that the official control (comprising meat and food safety inspections) in slaughterhouses is performed according to legislation. Previous information on the functionality of these audits and on non-conformities observed in the official control of slaughterhouses is limited. In this study, non-conformities of the official control of slaughterhouses and their correction were analysed from the internal audit reports of the Finnish Food Safety Authority Evira. To further assess the benefits and needs for improvement of the audits, we conducted interviews with the chief official veterinarians (OVs) responsible for the controls in slaughterhouses and the auditors of Evira. According to our results, non-conformities, especially in the inspection of intestines of bovines and swine, were common. Regarding food safety inspections, OVs should develop their documentation, perform the follow-up of the correction of non-compliances more systematically, and improve the enforcement, especially in smaller red meat slaughterhouses. Based on our results, internal audits appeared to be beneficial, as non-conformities in the official control were noticed, most non-conformities were corrected or corrective measures had been taken, and the audits were assessed as necessary by both the auditors and auditees. Our results can be utilized in improving the official control and audit procedures in slaughterhouses. In the future, the uniformity of meat inspection could be improved by auditing also differences in the rejections and their reasons between official auxiliaries in post-mortem inspection.Peer reviewe

Variation in the prevalence of enteropathogenic Yersinia in slaughter pigs from Belgium, Italy, and Spain

Tonsils of 829 fattening pigs originating from Belgium (n = 201), Italy (n = 428), and Spain (n 200) were collected between 2005 and 2007 to study the prevalence of enteropathogenic Yersinia in slaughter pigs. Isolation of Yersinia enterocolitica and Yersinia pseudotuberculosis was done by selective enrichment and by cold enrichment for 7 and 14 days. Pathogenic Y. enterocolitica and Y. pseudotuberculosis isolates were identified by polymerase chain reaction targeting the chromosomal genes ail and inv, respectively, as well as the plasmid-encoded virF of both species. A significantly higher (p < 0.001) prevalence of ail-positive Y. enterocolitica in Spain (93%) than in Belgium (44%) or Italy (32%) was observed. virF-positive Y. enterocolitica was present in 77% of ail-positive samples. Bioserotype 4/O:3 was the most common type in all three countries. Bioserotypes 2/O:5 and 3/O:9 were found in Italy (1%) and Belgium (9%), respectively. The prevalence of inv- and virF-positive Y. pseudotuberculosis was 2% and 1% in Belgium and Italy, respectively. Y. pseudotuberculosis was not detected in pigs from Spain. Bioserotypes 1/O:1 (20%), 1/O:2 (20%), and 2/O:3 (60%) were found in Belgium, and 1/O:1 (60%) and 2/O:3 (20%) in Italy. The most efficient method for isolation of Y. enterocolitica was combined cold enrichment for 7 and 14 days; however, the isolation method for Y. pseudotuberculosis was cold enrichment for 14 days. Fattening pigs seemto be an important reservoir of pathogenic Y. enterocolitica in Belgium, Italy, and Spain. Bioserotype 4/O:3 of Y. enterocolitica and bioserotypes 2/O:3 and 1/O:1 of Y. pseudotuberculosis have been shown to predominate

Most common meat inspection findings of sheep in a Finnish slaughterhouse : a descriptive study

Peer reviewe

Low prevalence of Yersinia enterocolitica 4:03 in sow tonsils

Yersinia enterocolitica 4:03 is the most common bioserotype causing disease in humans in Finland. Prevalence of Yersinia enterocolitica 4:03 in tonsils of fattening pigs has shown to be high in Finland in earlier studies. However, the prevalence in sow tonsils has not been studied. The aim of this study was to compare the prevalence of Y. enterocolitica 4:03 between tonsils of fattening pig and sows

Presence of foodborne pathogens, extended-spectrum beta-lactamase -producing Enterobacteriaceae, and methicillin-resistant Staphylococcus aureus in slaughtered reindeer in northern Finland and Norway

Background: Various food-producing animals were recognized in recent years as healthy carriers of bacterial pathogens causing human illness. In northern Fennoscandia, the husbandry of semi-domesticated reindeer (Rangifer tarandus tarandus) is a traditional livelihood and meat is the main product. This study determined the presence of selected foodborne pathogens, methicillin-resistant Staphylococcus aureus (MRSA), and extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae in healthy semi-domesticated reindeer at slaughter in northern Finland and Norway. Results: All 470 reindeer fecal samples tested negative for Salmonella spp., whereas L. monocytogenes was detected in 3%, Yersinia spp. in 10%, and Shiga toxins genes (stx1 and/or stx2) in 33% of the samples. Listeria monocytogenes isolates belonged to the serotype 1/2a (14/15) and 4b, Yersinia spp. were identified mainly as Y. kristensenii (30/46) and Y. enterocolitica (8/46), and stx2 predominated among the Shiga toxin genes (stx2 alone or in combination with stx1 was found in 25% of the samples). With regard to the frequency and distribution of stx1/stx2, striking differences were evident among the 10 different areas of origin. Hence, reindeer could constitute a reservoir for Shiga toxin-producing E. coli (STEC), but strain isolation and characterization is required for verification purposes and to assess the potential human pathogenicity of strains. On the other hand, the favorable antibiotic resistance profiles (only 5% of 95 E. coli isolates were resistant to one or more of the tested antibiotics) and the absence of MRSA and ESBL-producing Enterobacteriaceae (when applying selective methods) suggest only a limited risk of transmission to humans. Conclusions: Healthy semi-domesticated reindeer in northern Finland and Norway can be carriers of certain bacterial foodborne pathogens. Strict compliance with good hygiene practices during any step of slaughter (in particular during dehiding and evisceration) is therefore of central importance to avoid carcass contamination and to prevent foodborne pathogens from entering the food chain.Peer reviewe