Alphitobius diaperinus Panzer (Insecta, Coleoptera) in a single house of a broiler production facility as a potential source of pathogenic bacteria for broilers and humans.

Pest infestation in any stage can lead to a quality reduction in the finished products. This study aimed to detect Escherichia coli, Salmonella spp., Campylobacter spp., and Staphylococcus aureus in Alphitobius diaperinus adults, and in samples from broiler swabs, administered water and feed collected in a single house from a broiler production facility in central Italy. Three samplings were carried out, each collecting ninety adult beetles for microbial detection in the external, faecal and internal content; ten cloacal swab samples; and one sample of both administered feed and water. Microbiological cultures and biochemical identification were performed on suspected cultures and confirmed by species-specific PCRs. A. diaperinus was abundantly found near the windows, under the manger and in the corners of the facility. Salmonella enterica serovar Cholerasuis was found at the external surface of the beetles, while Staphylococcus xylosus and E. coli were in the faecal content. The latter micro-organism together with Staphylococcus lentus, S. xylosus and other staphylococcal species were detected in the internal microbiota. E. coli and Campylobacter spp. were observed in cloacal swabs, and S. xylosus in one feed sample. The study findings support evidence for Salmonella spp. and E. coli, and remark that adherence to sanitation rules and biosecurity procedures are required.

New Delhi metallo-ß-lactamase (NDM-1)-producing Klebsiella pneumoniae of sequence type ST11: first identification in a hospital of central Italy.

The emergence of novel resistant markers hampers the efficacy of beta-lactam antibiotics to treat infections caused by micro-organisms carrying such resistances. This study investigated the antimicrobial susceptibility pattern, the carpapenem-associated determinants and the molecular epidemiology of Klebsiella pneumoniae showing a New Delhi (NDM) metallo-ß-lactamase phenotype, isolated from a patient admitted to intensive care unit of the main hospital for acute care of Molise region, central Italy. Antimicrobial susceptibility was assessed for nineteen antibiotics by disc diffusion and agar dilution methods. Carbapenem-associated resistance determinants were detected through gene-specific amplifications, targeting blaNDM-1 , blaSHV and blaTEM , blaCTX-M , blaKPC , blaVIM , blaIMP , blaGES and blaOXA-48-lixe . Molecular characterization was carried out through multilocus sequence typing. The strain showed a multidrug resistant profile, and PCR and sequencing confirmed the presence of blaNDM-1 gene. Among the multiple resistance-associated determinants tested, the isolate, which was assigned to the sequence type ST11, only harboured blaSHV and blaTEM genes. This is the first report of NDM-1 variant in the regional healthcare setting for acute patients, raising significant concerns about the increase in the antimicrobials resistance spread through a different mechanism from the endemic KPC carbapenemase, and underlining the circulation of a virulent clone never identified before in this area.

High resolution melting analysis for the characterization of lineage II Listeria monocytogenes serovars 1/2a and 1/2c based on single nucleotide polymorphisms identification within the Listeria Pathogenicity Island-1 and inlAB operon: a novel approach for epidemiological surveillance.

AIMS: A high resolution melting (HRM) assay was developed for characterizing lineage II Listeria monocytogenes based on the amplification and the melting profiles analysis of 81 fragments targeting the region from the prs to ldh loci, including the Listeria Pathogenicity Island-1 (LIPI-1) genes and the inlAB operon. METHODS AND RESULTS: Real-time PCR and HRM protocols were standardized using 10 replicate assays from L. monocytogenes EGD-e reference strain (serovar 1/2a). Twenty wild-type isolates of serovar 1/2a and two of serovar 1/2c were tested, and differences between EGD-e strain and the wild-type isolates were defined if the melting temperature (Tm ) of an amplicon was not within the lower and the upper limits calculated from replicate testing on EGD-e. The analysis revealed 17 and 19 HRM profiles with respect to prs/LIPI-1/ldh and inlAB target regions (Simpson's Index of Diversity 0·979 and 0·983) respectively. The 1/2c cultures showed 98·1% similarity to melting characteristics with EGD-e, whilst 1/2a isolates had the greatest heterogeneity that was related to inlA, inlB and actA genes. Sequencing of amplicons generating different Tm values from EGD-e confirmed the presence of point mutations. CONCLUSIONS: This method was useful for L. monocytogenes subtyping based on single nucleotide polymorphisms detection through the melting behaviour analysis of main virulence genes. SIGNIFICANCE AND IMPACT OF THE STUDY: The study underlines the effectiveness of HRM in differentiating L. monocytogenes strains with high discriminatory power, thus rendering it useful for epidemiological surveillance.

A multicentre study on epidemiology and prevention of needle stick injuries among students of nursing schools.

INTRODUCTION: Among the health professions with a long period of training, the students of the Nursing Bachelor's Degree are the most exposed to biological risk resulting from accidents, in particular with needles and cutting edges. The aim of the study was to estimate the frequency and the circumstances for the occurrence of needle stick injuries, as a knowledge base for targeted prevention interventions. METHODS: The study was carried out between May and July 2017 in 11 Universities in Italy and 1 in Albania (associated with the "Tor Vergata" University of Rome). An anonymous semi-structured questionnaire was proposed to 1st (second semester), 2nd and 3rd year students of Nursing Bachelor's Degree. RESULTS: A total of 2742 questionnaires were collected. The average age of participants was 22.9 years (median 22, range 19-60 years), 73% of whom were females. A total of 381 injuries were reported. Three hundred and sixteen students (11.8%) underwent at least 1 injury (12.7% among females, 9.7% among males); 41 students declared two or more injuries; four students did not report the number of injuries occurred. The first injury occurred, as an average, 17 days after the start of the internship (median 15 days) and, in 25% of the cases, during the first 9 days. The highest percentage of accidents occurred during the first internship (25.3% of the total) and decreased with the progress of the training path. The injuries occurred in 38% of cases during drug preparation, 24% when disposing of sharp devices, 15% while re-capping needles, 13% during blood sampling and 10% in other circumstances. In 51.2% of cases, the needle was not sterile. Among the nursing students who suffered a needle stick injury, 58.1% declared that they had performed the post-exposure prophylaxis. 96% of students stated to be vaccinated against Hepatitis B virus. Amongst the students who had their serological status checked (74%), 18% stated the antibody titre was not protective. 49.8% of students answered to have been trained in advance on the correct procedures to avoid needle stick and cutting edges injuries in each clinical ward attended, 41.2% referred that this occurred only in some wards and 10% in no ward at all. CONCLUSION: The results of this study show a high percentage of needle stick injuries in students of the Nursing Bachelor's Degree. Therefore, there is a need for careful reflection on the most effective methods of targeted training acquisition of knowledge, skills and behavioural models useful for the exercise of the profession.

Knowledge, experiences, and attitudes toward Mantoux test among medical and health professional students in Italy: a cross-sectional study.

BACKGROUND: The World Health Organization's Action Framework for tuberculosis elimination in low-tuberculosis incidence countries includes the screening for active and latent tuberculosis in selected high-risk groups, including health care workers. In this context, medical and health profession students, exposed to nosocomial tuberculosis transmission during training and clinical rotations, are target populations for tuberculosis screening. No updated data are available on tuberculosis screening practice and knowledge of medical and health profession students in Italy. METHODS: Within the activities Italian Study Group on Hospital Hygiene of the Italian Society of Hygiene, Preventive Medicine and Public Health, we carried out a multicentre cross-sectional study to assess knowledge, attitude and practices on tuberculosis prevention and control among Medical, Dentistry, Nursing and other health professions' students. Students were enrolled in the study on a voluntary basis and were administered a previously piloted structured questionnaire. Logistic regression models were applied to explore knowledge on tuberculosis prevention by selected socio-demographic variables and University-based tuberculosis prevention practice. RESULTS: Students of seventeen Universities across Italy participated in the study, and 58.2% of them received compulsory tuberculin skin test either at enrollment or while attending clinical practice. A total of 5,209 students filled the questionnaire. 37.7% were medicine and dentistry students (Group 1), 44.9% were nursing students (Group 2) and 17.4% were other health professions' students (Group 3). Age and gender had different distributions by groups, as well as knowledge and practice on tuberculin skin test. 84.4% of the study population (95% CI = 83.3-85.3) was aware of the existence of the tuberculin skin test, 74.4% (95% CI = 73.2-75.6) knew what is the first-level screening test for latent tuberculosis and only 22.5% (95% CI = 21.4-23.6) knew how to proceed after a positive tuberculin skin test result. Overall, knowledge on tuberculosis prevention was higher in Group 2 and lower Group 3, as compared to Group 1. CONCLUSION: In Italy, the knowledge on tuberculosis screening among University students is generally good. To reduce some of the criticalities found among the different study courses, it would be appropriate to harmonize both the regulations on tuberculosis screening practices for admission to University courses, and the educational activities on the topic of tuberculosis, to be extended to all workers involved in health care setting.

[Molecular epidemiology of infectious diseases: analytical methods and results interpretation]. / Epidemiologia molecolare delle malattie infettive:metodi di analisi ed interpretazione dei risultati .

Molecular typing and fingerprinting of microbial pathogens represent an essential tool for the epidemiological surveillance, outbreak detection and control of infectious diseases. Indeed, epidemiological investigation without genotyping data may not provide comprehensive information to allow the most appropriate interventions; despite this consideration, some barriers still hamper the routine application and interpretation of molecular typing data. In this paper, the most important methods currently used for characterization of pathogenic microorganisms for microbial source tracking and for the identification of clonal relationships among different isolates, are described according to their principles, advantages and limitations. Criteria for their evaluation and guidelines for the correct interpretation of results are also proposed. Molecular typing methods can be grouped into four categories based on different methodological principles, which include the characterization of restriction sites in genomic or plasmid DNA; the amplification of specific genetic targets; the restriction enzyme digestion and the subsequent amplification; sequence analysis. Although the development and the extensive use of molecular typing systems have greatly improved the understanding of the infectious diseases epidemiology, the rapid diversification, partial evaluation and lack of comparative data on the methods have raised significant questions about the selection of the most appropriate typing method, as well as difficulties for the lack of consensus about the interpretation of the results and nomenclature used for interpretation. Several criteria should be considered in order to evaluate the intrinsic performance and practical advantages of a typing system. However none of the available genotyping methods fully meets all these requirements. Therefore, the combined use of different approaches may lead to a more precise characterization and discrimination of isolates than a single method, especially if used in a hierarchical manner. The interpretation of the molecular results differs according to the typing system's characteristics: for example in the restriction fragments-based analysis, the divergences or the similarity percentages among the profiles are evaluated, whilst the differences in terms of number and intensity of bands are analyzed in the amplification-based approaches. Moreover, a correct interpretation of molecular results significantly depends by other critical factors, such as the comprehension of the typing system and data quality, the microbial diversity, and the epidemiological context in which the method is used. The analysis of PFGE data, considered as the "gold standard", is based on the differences of the number and position of bands patterns, although recent recommendations are now available from the Centers for Diseases Control and Prevention (CDC) for a more accurate interpretation, which also include the evaluation of the gel quality, the genetic diversity of the microorganism, the time and geographical scale of an epidemic event. Future advances in the molecular typing technologies indeed will provide rapid methodological improvements, such as a greater degree of automation, better resolution, higher throughput, and a greater availability of dedicated bioinformatics tools. These factors will all contribute to an increasing application of genotyping methods to better understand the epidemiology of infectious diseases, and to implement, along with the strengthened international and interdisciplinary partnerships, more effective control and prevention strategies for Public Health improvements.

[Vibrio spp. infections of clinical significance and implication for public health]. / Infezioni da Vibrio spp. di interesse clinico e problematiche di Sanitå Pubblica.

Vibrio spp. infections still are a Public Health concern. Vibrio spp. can be found in marine, estuarine, and freshwater environments, and can be able to cause diseases in fish, shellfish, mammals, as well as in humans. Since '80 to date, the number of species within the genus increased from 21 to more than 100. The most important is Vibrio cholerae, the etiological agent of the cholera, responsible of seven pandemics; serotypes O1 and O139 can produce cholera toxin, while serotypes non-O1/non-O139 are generally associated with sporadic cholera cases and extraintestinal infections. Vibrio parahaemolyticus is an important cause of gastroenteritis associated with contaminated seafood consumption, whereas Vibrio vulnificus and V. alginolyticus can be related to wound infections or seafoodborne primary septicemia in immunocompromised patients. Disease prevention is mainly based on the application of proper individual or collective preventive measures.

Microbiological and toxicological quality of dried herbs.

AIMS: The microbiological and toxicological quality of 51 samples of dried herbs (Melissa officinalis, Salvia officinalis, Malva sylvestris, Matricaria chamomilla, Alchemilla vulgaris and Centaurea cyanus) cultivated in family-managed farms in Molise Region (Italy) was evaluated. METHODS AND RESULTS: All the samples were analysed by using conventional methods, and for samples preparation, an alternative Washing and Shaking (WaS) protocol was developed to reduce release of antimicrobial compounds. None of the samples were of unsatisfactory quality with respect to aflatoxin B1, and only three samples from Malva sylvestris exceeded the limit of total aflatoxins according to Recommendation 2004/24/EC. The International Commission on Microbiological Specifications for Foods limits for mesophilic bacteria and total coliforms were exceeded in the 29.4 and 3.9% of samples, respectively: 7.8% of samples also exceeded the limit for Escherichia coli established by European Spice Association. When the 'WaS' method was used, higher microbial counts were obtained, especially for A. vulgaris, S. officinalis and M. officinalis. CONCLUSIONS: Herbs cultivated in family-managed small agricultural areas showed a good microbiological and toxicological quality, irrespectively of preliminary washing or selection procedures. SIGNIFICANCE AND IMPACT OF THE STUDY: Herb matrices may contain antimicrobial activity which should be considered when applying the conventional microbiological methods for sample preparation. Alternative preparation protocols may have advantages to reduce antimicrobial effects and should be further evaluated.

Typing of Listeria monocytogenes strains isolated in Italy by inlA gene characterization and evaluation of a new cost-effective approach to antisera selection for serotyping.

AIMS: In this study, 105 Listeria monocytogenes strains isolated from humans, foods and environmental samples were characterized using several typing methods. Moreover, serotyping procedure was evaluated, and a cost-effective methodological approach based on preliminary PCRs screening was proposed. METHODS AND RESULTS: The isolates were analysed by conventional serotyping, multiplex-PCRs for serogroup and lineage identification and PCR-RFLP of inlA gene to identify potentially noninvasive L. monocytogenes. Among the strains, only the serotypes 1/2a, 1/2c, 1/2b, 4b and 3a were identified. The isolates were classified into serogroups I (58.10%), II (22.85%), III (12.38%) and IV (6.67%). Among clinical strains, lineage I was more represented (68.75%) than lineage II; whereas, lineage II was more associated with food (90.24%) and environmental (85.72%) isolates. Most of food (89.02%) and environmental (85.71%) isolates were classified into truncated InlA profiles, whereas the 93.75% of clinical strains were associated with a complete form of the protein. CONCLUSION: Molecular techniques were sensitive and specific for classifying strains into serogroup and lineage and in agreement with the serotyping. Moreover, a preliminary PCRs-based screening was proposed to select only the necessary antisera by a flow chart; this methodological approach allows cost saving up to 42%. Our results further suggest the role of InlA protein in human listeriosis, particularly in immunocompetent individuals, and a correlation between truncated protein and serotype. SIGNIFICANCE AND IMPACT OF THE STUDY: This study further validates molecular methods for L. monocytogenes analysis and proposed a new cost-effective approach for serotyping. It could help to improve a national surveillance network for L. monocytogenes infections in Italy.

[Prevalence of Listeria spp. in dairy farm and evaluation of antibiotic-resistance of isolates]. / Prevalenza di Listeria spp. in aziende produttrici di latte e valutazione dell'antibiotico-resistenza dei ceppi isolati.

The study was performed to estimate the prevalence and antimicrobial sensitivities of Listeria spp. in raw milk, feaces end environmental samples isolated from 10 dairy in Molise Region. A total of 454 samples were collected, which comprised 40 raw milk, 40 animal faeces and 374 environmental samples. Listeria monocytogenes was never isolated from raw milk specimens; one was isolated from faeces speciments and two were isolated from environmental samples. All isolates were resistant to two or more of antimicrobial agents tested (cephalotin, ampicillin, tetracycline, co-trimoxazole, erytromicin, clindamycin, gentamicin, oxacillin). One isolate of L. monocytogenes was susceptible to all antimicrobial agents tested except oxacillin. This study indicates that faeces, equipments and environment are important reservoirs of Listeria spp. in dairy farm, and can represent potential source of contamination of raw milk. However, the contamination of milk, and the risk of infection, can be effectively eliminated by pasteurisation process.

Molecular characterisation and antimicrobial resistance of Vibrio vulnificus and Vibrio alginolyticus isolated from mussels (Mytilus galloprovincialis).

Twelve Vibrio vulnificus biotype 1 and 11 Vibrio alginolyticus isolated from mussels in Italy were analysed by antimicrobial resistance, plasmid profiles, random amplification of polymorphic DNA (RAPD), and single enzyme amplified fragment length polymorphism (sAFLP). Plasmid DNA was detected in three V. vulnificus and four V. alginolyticus cultures. All isolates were resistant to at least two antimicrobial agents: all isolates were resistant to ampicillin, carbenicillin and streptomycin, except one V. alginolyticus which was sensitive to carbenicillin and two V. alginolyticus which were sensitive to streptomycin. No association was detected between the presence of plasmid DNA and antimicrobial resistance. Seven of the twelve V. vulnificus and two of the eleven V. alginolyticus cultures were susceptible to the 10 microg of the vibriostatic compound O/129; all cultures were susceptible to the 150 microg of O/129. Both RAPD and sAFLP was found to be reproducible. Ten sAFLP and seven RAPD profiles were detected amongst the 12 V. vulnificus cultures: three cultures were identified as indistinguishable by both methods. RAPD and sAFLP analysis of V. alginolyticus generated nine and seven profiles respectively, and these two methods were independent. These results demonstrate extreme variability of V. vulnificus and V. alginolyticus isolated from mussels, and both RAPD and sAFLP provided information on intraspecific differences which will be useful for molecular epidemiological or ecological studies. A combination of methods gave optimal discrimination, although a single method could provide sufficient information to characterise V. vulnificus isolates.

Occurrence of Vibrio and other pathogenic bacteria in Mytilus galloprovincialis (mussels) harvested from Adriatic Sea, Italy.

Sixty-two samples of Mytilus galloprovincialis (mussels) harvested from approved shellfish waters in the Adriatic Sea were examined for the presence of Vibrio, Salmonella, Campylobacter, and verocytotoxin producing Escherichia coli. Vibrio spp. were isolated from 48.4% of samples; the species most frequently found were V. alginolyticus (32.2%) and V. vulnificus (17.7%), followed by V. cincinnatiensis (3.2%), V. parahaemolyticus (1.6%), V. fluvialis (1.6%) and V. cholerae non-O1 (1.6%). V. parahaemolyticus resulted negative to Kanagawa-phenomenon and to PCR amplification of tdh gene. V. cholerae resulted negative to PCR amplification of sto gene. No Salmonella, Campylobacter, or E. coli verocytotoxin-producing strains were isolated. The results of this study suggest the potential risk of ingesting raw or undercooked mussels due to the frequent presence of potentially pathogenic Vibrio species.

Prevalence of Helicobacter-like organisms in porcine gastric mucosa: a study of swine slaughtered in Italy.

Recent reports described some cases of gastritis in man caused by an uncultured gram-negative spiral bacterium morphologically identical to organisms observed in the stomachs of mammalians (e.g. cats, dogs, pigs). The aim of the present study is to confirm the presence of these bacteria in Italian swine. Tightly spiralled organisms (Gastrospirillum suis) were found in the stomach of eight (9.4%) out of 85 pigs examined. The bacteria were always associated with macroscopic lesions indicative of gastritis. Attempts to culture H. pylori or Helicobacter-like organisms were unsuccessful. The possibility that Gastrospirillum may be a zoonotic pathogen, with transmission occurring from pigs to humans, is discussed.

Evaluation of immunomagnetic separation and plating media for recovery of Salmonella from meat.

Immunomagnetic separation (IMS) was compared with selective enrichment in selenite cystine (SC) broth for isolation of Salmonella from 86 artificially contaminated ground beef samples. Both Rambach agar (RA) and Hektoen enteric (HE) agar were used as selective plating media. The highest count of Salmonella colonies per plate was obtained after enrichment in SC broth and plating on RA (mean value: 111.1+/-58.1 CFU per plate); the lowest count was obtained after IMS and plating on HE agar (mean value: 65.4+/-36.6 CFU per plate). Salmonella in preenrichment was concentrated 1.7-fold by IMS and represented 31% of the microbial population captured by the beads, but nonspecific binding was high. As a result of the large numbers of competing bacteria, isolations on both RA and HE agar following IMS were quite difficult (mean value for Salmonella colonies: 79.9+/-42.7 CFU per plate; mean value for non-Salmonella colonies: 144.1+/-75.7 CFU per plate; ratio of Salmonella to non-Salmonella colonies: 0.8). This study indicates that SC broth is superior to IMS in the isolation of Salmonella from raw ground meat.

[Detection of Salmonella, Listeria spp., Vibrio spp., and Yersinia enterocolitica in frozen seafood and comparison with enumeration for faecal indicators: implication for public health]. / Ricerca di Salmonella, Listeria spp., Vibrio spp. e Yersinia enterocolitica in prodotti ittici congelati e surgelati del commercio e correlazione con gli indici di contaminazione fecale: implicazioni in Sanità Pubblica.

Infections transmitted through consumption of contaminated seafood is a significant source of human morbidity. The aim of this study was to compare the detection of Salmonella, Listeria, Vibrio, and Yersinia enterocolitica in frozen seafood with results from enumeration of conventional faecal indicators. A total of 213 crustaceans or molluscs were purchased from local vendors in Italy: 74% were harvested in Italy, 25% from other European countries and 1% from outside Europe. Listeria spp. was isolated from 20% of samples, Vibrio spp. from 11%, Salmonella from 3% and Y. enterocolitica from 1%. Listeria species isolated were L. monocytogenes, L. innocua, L. welshimeri, L. ivanovii and L. seeligeri. Vibrio species isolated were V. alginolyticus and V. fluvialis. The most contaminated shellfish for both faecal indicator microrganism and pathogens were hen clams (6% contained Salmonella, 27% Listeria spp. and 3% Y. enterocolitica), while from 27% of shrimps Vibrio spp. was recovered. Higher levels of faecal indicators were recovered from samples harvested outside Europe, and 66% of samples harvested in Thailand were contaminated from Salmonella. Significant differences were found in the levels of contamination of seafoods depending upon the freezing regime, but there was a limited association between presence of potential pathogens (particularly Vibrio spp.) and conventional faecal indicators. Hence, we suggest reconsideration of current legal parameters to evaluate microbiological quality of seafood.

[Molecular typing by amplified fragment length polymorphism and PCR-restriction fragment length polymorphism , biotyping and antimicrobial susceptibility of Campylobacter jejuni]. / Tipizzazione molecolare mediante Amplified Fragment Length Polymorphism e PCR-Restriction Fragment Length Polymorphism, biotipizzazione e determinazione dell'antibiotipo di Campylobacter jejuni.

Molecular typing systems have provided invaluable information for tracking infectious agents through the food chain. These tools have been essential for understanding the epidemiology of gastrointestinal infectious diseases, therefore providing essential and evidence-based information for appropriate interventions and preventative measures. Two such molecular typing techniques based on the polymerase chain reaction (PCR) that have been applied to the epidemiology of foodborne pathogens are, amplified fragment length polymorphism (AFLP) and restriction fragment length polymorphism (RFLP) analysis. Campylobacter is responsible for one of the most common bacteria foodborne gastrointestinal infections affecting humans, especially in developed countries. The object of this paper is to apply AFLP and RFLP analysis of the flagellin (flaA) gene to 18 isolates of Campylobacter jejuni from human sporadic cases in Italy. Results of these analyses were compared to the phenotypes of these isolates based on biotyping and antimicrobial resistance determinations. All isolates were typable by the four methods. The RFLP procedure was performed with DdeI and HinfI enzymes, and 12 and 8 distinct profiles respectively were recognised. AFLP analysis was more discriminatory, and recognised 16 different profiles. Results from AFLP were reproducible and applicable for definitive characterisation of C. jejuni isolated from different outbreaks. PCR-RFLP of the flaA gene represents a useful tool only to compare isolates within a single outbreak.

In situ mapping of urease-positive areas in porcine gastric mucosa.

Urease activity is a feature of gastric helicobacters, and its abundant production provides an indirect means of detecting their colonization. A method for mapping urease-positive areas directly on the gastric mucosa was developed, and 57.8% of pigs had evidence of Helicobacter colonization based on urease assay. Moreover, 89.2% of urease-positive pigs had gastritis, confirming that the known association found in man between Helicobacter and gastritis was found also in pigs. The proposed urease assay allowed detection of all urease-positive areas on the gastric mucosa, thus overcoming the biopsy sampling problems derived from the patchy distribution of helicobacters. In this way, gastric mucosa specimens from urease-positive areas could be usefully utilized for culture attempts and for microscopic examination.