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Occurrence, virulence gene and antimicrobial susceptibility profiles of Arcobacter sp. isolated from catla (Catla catla) in India

In the present study, a total of 100 catla (Catla catla—major South Asian carp, local name botcha) collected from local fish markets and aquaculture ponds were subjected for isolation and characterization of Arcobacter sp. In all, 21 Arcobacter sp. were isolated, of which 18 (85·7%) were Arcobacter butzleri and three (14%) were A. cryoaerophilus as identified by multiplex PCR. All 18 A. butzleri isolates were positive for mviN, ciaB and tlyA virulence genes, three of A. cryoaerophilus isolates carried mviN gene and none of the isolates were positive for cadF, irgA, cj1349, hecA and hecB genes. All isolates (n = 21) were resistant to penicillin (100%). Meanwhile, 71·43, 23·81, 23·81, 14·29 and 9·52% of the isolates showed resistance towards vancomycin, nalidixic acid, erythromycin, cefixime and kanamycin, respectively. Multidrug resistance was observed in 23·81% of the Arcobacter sp. isolates and none of the isolates were positive for any of the extended spectrum beta‐lactamases either by phenotypic or by molecular identification genes (blaOXA, blaSHV, blaTEM, blaCTX‐M1, blaCTX‐M2 and blaCTX‐M9 groups). The results emphasize the need to implement specific control procedures to reduce the use of antibiotics in aquaculture particularly the ones which are very important in human medicine.