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. 2019;12(3):418-423.
doi: 10.14202/vetworld.2019.418-423. Epub 2019 Mar 16.

Multidrug-resistant enterobacteria colonize commercial day-old broiler chicks in Nigeria

Obianuju Nkiruka Okorafor  1 , Madubuike Umunna Anyanwu  2 , Emmanuel Onyeka Nwafor  1 , George Nnamdi Anosa  1 , Rita Ijeoma Udegbunam  3
Affiliations

Multidrug-resistant enterobacteria colonize commercial day-old broiler chicks in Nigeria

Obianuju Nkiruka Okorafor et al. Vet World. 2019.

Abstract

Aim: This study was conducted to isolate generic enterobacteria from day-old broiler chicks in Nigeria, determine the antibacterial resistance profile, and assess multidrug resistance.

Materials and methods: The birds were sourced from five purposively-selected hatcheries (identified as A, B, C, D and E) in Southwest Nigeria. Non-duplicate cloacal swabs were collected from a total of 75 (15 birds per hatchery) randomly selected apparently healthy birds. Sampling was done in three batches of five chicks per batch at 2-week interval. Isolation of enterobacteria was done using MacConkey agar. The resistance of the isolates was determined using the disk diffusion method.

Results: Of 15 processed samples of birds from each hatchery, all samples from hatcheries B, D, and E, 10 (66.7%) and 14 (93.3%) samples from hatcheries A and C, respectively, yielded pure cultures of Escherichia coli. Klebsiella was also isolated from 1 (7.1%) of the 14 and 2 (13.2%) of the 15 growth-positive samples from hatcheries C and D, respectively. The range of resistance among E. coli isolates was tetracycline (86.7-100%), ampicillin (80-100%), gentamicin (60-85.7%), sulfamethoxazole-trimethoprim (46.7-92.9%), enrofloxacin (40-100%), ciprofloxacin (26.7-86.7%), streptomycin (10-80%), cefotaxime (26.7-73.3%), amoxicillin-clavulanic acid (13.3-60%), and ceftazidime (6.7-40%). Klebsiella and all E. coli isolate from chicks of hatcheries B, C, and E, 80 and 93.3% of those from chicks of hatcheries A and D, respectively, exhibited resistance to three or more classes of antibacterial agents.

Conclusion: Commercial day-old broiler chicks in Nigeria are colonized by multidrug-resistant coliforms (E. coli and Klebsiella) and are potential reservoirs and disseminators of these organisms.

Keywords: Enterobacteriaceae; avian; coliforms; day-old chicks; multidrug resistant.

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