Influence of Temperature, Source, and Serotype on Biofilm Formation of Salmonella enterica Isolates from Pig Slaughterhouses.

Quantitative assessment of in vitro biofilm formation by 40 Salmonella enterica isolates isolated in pig abattoirs from animal and environmental sources (surfaces in contact and not in contact with meat) and classified in eight seroytpes was carried out by using a microtiter plate assay with spectrophotometric reading (optical density at 620 nm). Biofilm-forming ability was statistically correlated with the temperature of incubation (22 and 35°C), the source of the isolates, and the antimicrobial resistance profile. After incubation at 35°C, 9 isolates (22.

Identification of Spp. Strains Isolated from Meat Products and Meat Production Plants by Multiplex Polymerase Chain Reaction.

Listeriosis is a foodborne disease caused by and is considered as a serious health problem, due to the severity of symptoms and the high mortality rate. Recently, other species have been associated with disease in human and animals. The aim of this study was to develop a multiplex polymerase chain reaction (PCR) in order to simultaneously detect six species , , , , , in a single reaction.

Differential Gene Expression of Three Gene Targets among Persistent and Nonpersistent Listeria monocytogenes Strains in the Presence or Absence of Benzethonium Chloride.

Persistence of Listeria monocytogenes strains in food processing environments remains relatively common but is difficult to control. Understanding the basis for such persistence represents an important step in the potential control or eradication of this pathogen from these environments. In this study, reverse transcription PCR was used to determine the relative and absolute expression of selected gene targets (pocR, eutJ, and qacH) among five persistent and four presumed nonpersistent L.

Mislabelling and Species Substitution in Fishery Products Retailed in Sardinia (Italy), 2009-2014.

Mislabelling and species substitution are major concerns for fishery products marketed in the EU. The present survey aimed to investigate the correct enforcement of the Community and National rules on the labelling and marketing of fishery products retailed in Sardinia (Italy) between 2009 and 2014. A total of 3000 labels for fresh unpacked fishery products have been considered.

Hygiene and Welfare Evaluation of Pigs Slaughtered in Agritourisms.

The slaughtering procedures at agritourism farms must be carried out in accordance with the general and hygiene requirements of Regulations (EC) No 852 and 853/2004. In addition, regional laws define minimum requirements allowing some flexibility. Piglets and finishing pigs are the most frequently slaughtered animal in Sardinian agritourism farms.

Detection of Pathogenic in Slaughtered Pigs by Cultural Methods and Real-Time Polymerase Chain Reaction.

Healthy pigs carrying pathogenic to human strains are the main source of entry into slaughterhouse, where cross-contamination of carcasses can happen. The aim of this work was to determine prevalence in slaughtered pigs, investigating the presence of carriers in relation to carcass contamination. A total of 132 pig samples (tonsils, mesenteric lymph nodes, colon content, carcass surface) were collected from 4 Sardinian slaughterhouses.

Prevalence and Microbiological Contamination of Pig Carcasses and Slaughterhouse Environment.

In seven EC swine abattoirs prevalence (ISO 6579/2002) and serotypes of 25 piglets, 61 finishing pigs (lymph nodes, colon content, carcass and liver surface) and slaughterhouse environments (scalding water, surfaces in contact with meat and not in contact with meat) were investigated. Moreover, aerobic colony count [total viable count (TVC); ISO 4833] and (ISO 21528-2) of piglets and finishing pigs' carcasses were evaluated, and the results compared with EU process hygiene criteria (Reg. EC 2073/2005).

Detection and quantification of Vibrio parahaemolyticus in shellfish from Italian production areas.

Vibrio parahaemolyticus is a marine microorganism, recognized as an important cause of foodborne illness particularly in Asia, South America and United States. Outbreaks are rarely reported in Europe, but they can occur unexpectedly in relation, among other reasons, to the spread of highly virulent strains. It is known that the risk is proportional to exposure levels to pathogenic V.

Absolute and relative gene expression in Listeria monocytogenes using real-time PCR.

Reverse transcription combined with the polymerase chain reaction (RT-PCR) is a viable method widely used to quantify gene expression. There are two ways to quantify gene expression by real-time PCR: relative quantification and absolute quantification. Relative quantification relates the PCR signal of the target gene to a control gene, normally a housekeeping gene.

Presence and molecular characterization of the major serovars of Listeria monocytogenes in ten Sardinian fermented sausage processing plants.

The aim of the present study was to investigate the occurrence of Listeria monocytogenes in ten Sardinian fermented sausage processing plants. A total of 230 samples were collected and 40 L. monocytogenes isolates were obtained and subjected to serotyping and investigated for the presence of ten virulence-associated genes using multiplex PCR assays.

Qualitative and quantitative assessment of viral contamination in bivalve molluscs harvested in Italy.

Bivalve molluscs are a well documented source of viral infection. Further data on shellfish viral contamination are needed to implement European Regulations with sanitary measures more effective against viral pathogens. To this aim, 336 samples of bivalve molluscs (185 mussels, 66 clams, 23 oysters and 62 samples from other species) collected in harvesting areas of class A and B of four Italian Regions were analyzed for qualitative and quantitative determination of hepatitis A virus (HAV) and Norovirus (NoV) GI and GII, using real time RT-PCR.

Persistence in Ready-to-Eat Sausages and in Processing Plants.

is of major concern in the fermented meat products and is able to persist in their processing environments. The aim of the present work was to evaluate the virulence profile and the persistence capacity of strains isolated in Sardinian fermented sausages processing plants. Food (ground meat, sausages at the end of acidification and ripening stage) and environmental samples (a total of n.

Listeria monocytogenes in five Sardinian swine slaughterhouses: prevalence, serotype, and genotype characterization.

In a 3-year study (2008 to 2011) to estimate the prevalence and the contamination sources of Listeria monocytogenes in pork meat in Sardinia, Italy, 211 samples were collected from five Sardinian swine slaughterhouses: 171 samples from slaughtered pigs and 40 from the slaughterhouse environment. Fifty L. monocytogenes isolates were characterized by PCR-based serotyping, presence of virulence-associated genes, and pulsed-field gel electrophoresis restriction analysis.

Longitudinal study on the sources of Listeria monocytogenes contamination in cold-smoked salmon and its processing environment in Italy.

The aim of the present study was to investigate the sources of Listeria monocytogenes contamination in a cold smoked salmon processing environment over a period of six years (2003-2008). A total of 170 samples of raw material, semi-processed, final product and processing surfaces at different production stages were tested for the presence of L. monocytogenes.

Investigation of Salmonella enterica in Sardinian slaughter pigs: prevalence, serotype and genotype characterization.

In order to improve the knowledge about the presence of Salmonella in pork meat in Sardinia (Italy), the prevalence and the sources of Salmonella at 5 pig slaughterhouses (slaughtered pigs and environment) were investigated and the isolates were characterised. A total of 462 samples were collected, 425 from pigs at slaughter and 41 from the slaughterhouse environment. Salmonella was isolated from 26/85 (30.

Listeria monocytogenes in RTE foods marketed in Italy: prevalence and automated EcoRI ribotyping of the isolates.

The aims of the present study were: (a) to investigate the prevalence and the enumeration of Listeria monocytogenes in 200 samples of ready to eat (RTE) foods of animal and vegetal origin collected from different outlets and processing plants in Sardinia; (b) to characterize the isolates by phenotypical and molecular methods; (c) to analyze a subset of 42 L. monocytogenes by automated EcoRI ribotyping in order to predict the strain's potential virulence for humans. The strains were isolated from: smoked fish products, cooked marinated products, meat products and pre-packaged mixed vegetable salads.

Total lipids of Sarda sheep meat that include the fatty acid and alkenyl composition and the CLA and trans-18:1 isomers.

The total lipids of the longissimus dorsi muscle were analyzed from commercial adult Sarda sheep in Sardina taken from local abattoirs, and in the subsequent year from three local farms in the Sassari region that provided some information on the amount and type of supplements fed to the pasture-fed sheep. The complete lipid analysis of sheep meat included the fatty acids from O-acyl and N-acyl lipids, including the trans- and conjugated linoleic acid (CLA) isomers and the alk-1-enyl ethers from the plasmalogenic lipids. This analysis required the use of a combination of acid- and base-catalyzed methylation procedures, the former to quantitate the O-acyl, N-acyl and alkenyl ethers, and the latter to determine the content of CLA isomers and their metabolites.