title: Frequency, virulence genes and antimicrobial resistance of Listeria spp. isolated from bovine clinical mastitis.
abstract: The aims of this study were to determine the prevalence, characteristics and antimicrobial resistance of Listeria spp. isolated from bovine clinical mastitis in Iran. Listeria spp. were detected in 21/207 bovine mastitic milk samples from dairy farms in Iran, comprising L. monocytogenes (n=17), L. innocua (n=3) and L. ivanovii (n=1). L. monocytogenes isolates were grouped into serogroups '4b, 4d, 4e', '1/2a, 3a', '1/2b, 3b, 7' and '1/2c, 3c'; all harboured inlA, inlC and inlJ virulence genes. Listeria spp. were most frequently resistant to penicillin G (14/21 isolates, 66.7%) and tetracyclines (11/21 isolates, 52.4%).
authors.affiliation: Microbiology Division, Institute of Biological Science, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; Laboratory of Biomedical Science and Molecular Microbiology, Institute of Graduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: mordabenilofari@gmail.com.
authors.forename: Hossein
authors.initials: H
authors.lastname: Jamali
authors.forename: Behrad
authors.initials: B
authors.lastname: Radmehr
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002417:Cattle; D024881:Drug Resistance, Bacterial; D005260:Female; D007492:Iran / Q000453:epidemiology; D008087:Listeria / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D008088:Listeriosis / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D008414:Mastitis, Bovine / Q000453:epidemiology* / Q000382:microbiology; D008892:Milk / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000662:veterinary; D015995:Prevalence; D016036:Seroepidemiologic Studies; D014774:Virulence
chemical_list: D000900:Anti-Bacterial Agents
keywords: Antimicrobial resistance; Bovine mastitis; Internalin genes; Listeria spp.; Serogrouping