title: Clonal Occurrence of Salmonella Weltevreden in Cultured Shrimp in the Mekong Delta, Vietnam.
abstract: This study investigated the occurrence, serovar and antimicrobial resistance of Salmonella spp. in shrimp samples from intensive and extensive farms located in three different provinces in the Mekong Delta, Vietnam. Shrimp from 11 of the 48 farms all contained S. Weltevreden, except for one farm yielding S. Agona, with no difference in Salmonella occurrence between the two production systems. Pulsed field gel electrophoresis (PFGE) of S. Weltevreden showed closely related XbaI pulse types, suggesting a clonal relationship despite the farms and shrimp samples being epidemiologically unrelated. S. Weltevreden was susceptible to most antimicrobials tested, with a few strains being resistant to florfenicol, chloramphenicol, sulfamethoxazole or trimethoprim. Future studies of the ecology of S. Weltevreden should establish if this serovar may survive better and even multiply in warm-water shrimp farm environments compared to other Salmonella serovars.
authors.affiliation: Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Gazi Md
authors.initials: GM
authors.lastname: Noor Uddin
authors.affiliation: Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Marianne Halberg
authors.initials: MH
authors.lastname: Larsen
authors.affiliation: World Organization for Animal Health (OIE), National Reference Laboratory for Salmonella, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro (Padua), Italy.
authors.forename: Lisa
authors.initials: L
authors.lastname: Barco
authors.affiliation: College of Aquaculture & Fisheries, Can Tho University, Can Tho City, Vietnam.
authors.forename: Tran
authors.initials: T
authors.lastname: Minh Phu
authors.affiliation: Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Anders
authors.initials: A
authors.lastname: Dalsgaard
mesh_terms: D000818:Animals; D017756:Aquaculture; D024881:Drug Resistance, Bacterial / Q000235:genetics; D005516:Food Microbiology; D014644:Genetic Variation; D033561:Penaeidae / Q000382:microbiology*; D012475:Salmonella / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification*; D065288:Serogroup; D012758:Shellfish / Q000382:microbiology*; D014744:Vietnam