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Vibrio parahaemolyticus is a gram negative, halophilic bacterium that occurs in the coastal and estuarine environments worldwide and is implicated in several cases of seafood-born gastroenteritis around the globe. However, not all strains of V. parahaemolyticus are pathogenic. Clinical isolates of V. parahaemolyticus most often produce either the thermostable direct haemolysin (TDH) or TDH-related haemolysin (TRH) encoded by tdh and trh genes, respectively. A pandemic clone of O3:K6 which was first detected in Kolkata (India), has been responsible for many outbreaks in Asia and the USA. With the emergence of pandemic clone of V. parahaemolyticus, this organism has assumed significance. Although most of the V. parahaemolyticus outbreaks are invariably related to seafood consumption, pathogenic strains are rarely isolated from seafood. Virulent strains producing TDH or TRH and the pandemic clone, which is responsible for most of the outbreaks (that have occurred after 1996) have been rarely isolated from seafood and other environmental samples. This could be due to the occurrence of pathogenic strains in the estuarine environment at a lower level compared to non-pathogenic strains. Another reason can be that the pathogenic stains are more sensitive to dystropic conditions in the aquatic environment and rapidly become non-culturable. Similarity in growth kinetics between virulent and non-virulent strains also made the isolation of virulent strains from the aquatic environment difficult. Several studies were done to determine the factors responsible for an increased virulence and persistance of pandemic clone. However, none of those studies were conclusive. Several researchers have proposed various genetic markers for specific detection of pandemic clone of V. parahaemolyticus. But many of those genetic markers were found to be unreliable. Recently, seven genomic islands (VPaI-1 to VPaI-7) unique to pandemic clone were identified. This Research Topic is dedicated to improve our current understanding of ecology, pathogenesis and detection of pathogenic and pandemic clone of V. parahaemolyticus, and will also strive to identify areas of future development.

Virulence --- Vibrio parahaemolyticus --- Genomic Islands --- tdh --- trh --- pandemic clone

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Vibrio parahaemolyticus --- Vibrio infections --- Oysters --- Health risk assessment --- Shellfish as carriers of disease. --- Control --- Prevention. --- Contamination

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The worldwide emergence of antimicrobial-resistant bacteria, specially those resistant to last-resource antibiotics, is now a common problem being defined as one of three priorities for the safeguarding of One Health by the Tripartite Alliance, which includes the World Health Organization (WHO), the Food and Agriculture Organization (FAO) and the Office International des Epizooties (OIE). Bacteria resistance profiles, together with the expression of specific virulence markers, have a major influence on the outcomes of infectious diseases. These bacterial traits are interconnected, since not only the presence of antibiotics may influence bacterial virulence gene expression and consequently infection pathogenesis, but some virulence factors may also contribute to an increased bacterial resistance ability, as observed in biofilm-producing strains. The surveillance of important resistant and virulent clones and associated mobile genetic elements is essential for decision making in terms of mitigation measures to be applied for the prevention of such infections in both human and veterinary medicine. However, the role of natural environments as important components of the dissemination cycle of these strains has not been consider until recently. This Special Issue aims to publish manuscripts that contribute to the understanding of the impact of bacterial antimicrobial resistance and virulence in the three areas of the One Health triad–i.e., animal, human and environmental health.

Research & information: general --- Biology, life sciences --- Microbiology (non-medical) --- MRSA --- EMRSA-15 --- MLSB --- bacteremia --- bloodstream infections --- antibiotic resistance --- aquatic contamination --- probabilistic sampling --- San Francisco Estuary --- coast --- Pseudomonas --- Shewanella algae --- Vibrio parahaemolyticus --- biocide --- Listeria monocytogenes --- biofilm --- planktonic culture --- pulsed-field gel electrophoresis --- Escherichia coli --- fosfomycin --- nitrofurantoin --- antimicrobial resistance --- antibiotic susceptibility --- WGS --- phylogenetic analysis --- DNA mismatch repair system --- Salmonella Choleraesuis --- Iberian pig --- wild boar --- phylogenetic relationship --- plasmid replicon typing --- colistin --- carcass --- cfr gene --- fexA gene --- linezolid --- mutation --- pig --- public health --- S. aureus --- avian colibacillosis --- salmonellosis --- MDR --- tetA --- nisin --- mutant prevention concentration --- mutant selection window --- antimicrobial susceptibility testing --- horizontal gene transfer --- Salmonella --- reptiles --- isolation --- biofilms --- chlorhexidine gluconate --- wounds --- Gram-negative bacteria --- colonization --- infection --- clonal lineages --- resistance genes --- virulence factors --- Staphylococcus aureus --- skin and soft-tissue infections --- plasmids --- Panton–Valentine leucocidin --- MRSA --- EMRSA-15 --- MLSB --- bacteremia --- bloodstream infections --- antibiotic resistance --- aquatic contamination --- probabilistic sampling --- San Francisco Estuary --- coast --- Pseudomonas --- Shewanella algae --- Vibrio parahaemolyticus --- biocide --- Listeria monocytogenes --- biofilm --- planktonic culture --- pulsed-field gel electrophoresis --- Escherichia coli --- fosfomycin --- nitrofurantoin --- antimicrobial resistance --- antibiotic susceptibility --- WGS --- phylogenetic analysis --- DNA mismatch repair system --- Salmonella Choleraesuis --- Iberian pig --- wild boar --- phylogenetic relationship --- plasmid replicon typing --- colistin --- carcass --- cfr gene --- fexA gene --- linezolid --- mutation --- pig --- public health --- S. aureus --- avian colibacillosis --- salmonellosis --- MDR --- tetA --- nisin --- mutant prevention concentration --- mutant selection window --- antimicrobial susceptibility testing --- horizontal gene transfer --- Salmonella --- reptiles --- isolation --- biofilms --- chlorhexidine gluconate --- wounds --- Gram-negative bacteria --- colonization --- infection --- clonal lineages --- resistance genes --- virulence factors --- Staphylococcus aureus --- skin and soft-tissue infections --- plasmids --- Panton–Valentine leucocidin