Prevalence and antibiotic susceptibility of Listeria monocytogenes in raw milk from cattle herds within Sokoto Metropolis, Nigeria

Type Journal Article - Sokoto Journal of Veterinary Sciences
Title Prevalence and antibiotic susceptibility of Listeria monocytogenes in raw milk from cattle herds within Sokoto Metropolis, Nigeria
Author(s)
Volume 10
Issue 2
Publication (Day/Month/Year) 2012
Page numbers 13-17
URL http://www.ajol.info/index.php/sokjvs/article/download/82285/72442
Abstract
One hundred and ninety two raw milk samples were collected from lactating cows identified in Fulani herds and
small scale dairy farms within Sokoto metropolis in order to investigate the presence and determine the antibiotic
susceptibility of Listeria monocytogenes in the milk. Selective culture and identification method was employed for
the bacterial isolation and Kirby-Bauer technique was used for the antibiotic susceptibility test. Seventy six
samples (39.58%) were positive for Listeria species, which upon biochemical characterization 39(51.3%) were
Listeria innocua, 14(18.4%) Listeria ivanovii, 17(22.4%) Listeria monocytogenes, 4(5.3%) Listeria welshimeri and
2(2.6%) Listeria seeligeri. Antibiotic susceptibility test of the isolates revealed high resistance to ampicillin (100%),
and streptomycin (80%), followed by ampiclox (70%), tetracycline (30%), then gentamycin (20%) while, there was
no resistance to ciprofloxacin and chloranphenicol. The findings of this study necessitate the need for extension
personnel to educate the Fulani herdsmen, milk handlers and other livestock producers on the significance of
hygiene especially during milking and the effect of indiscriminate use of drugs particularly antibiotics. There is also
need for the agencies concerned such as the National Agency for Food and Drugs Administration and Control
(NAFDAC) to regulate the sales and use of both human and veterinary drugs by drug hawkers and other non -
professional veterinary practitioners.

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