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A total of 300 isolates of Bacillus cereus from nine of some Nigeria
food were tested for their sensitivity to ten commonly used antibiotics. An average of 25 isolates were obtained per food sample. All B. cereus isolates tested were found to be susceptible to ciprofloxacin (5 mg), chloramphenicol (30 mg), ofloxacin (10 mg) and less than 10% were resistance to gentamicin (10 mg) and nalidixic acid (10 mg). Overall
resistance to penicillin G (82%), cefotaxime (56.7%), ceftriaxone (53.3%) and ampicillin (44%) were most frequent, whereas isolates were least resistance to tetracycline (6.7%) nalidixic acid (3%) and gentamicin (1%). The predominant antimicrobial resistance patterns
irrespective of food source were cefotaxime, penicillin, ampicillin and ceftriaxone (23%), penicillin (16.3) and cefotaxime, penicillin and ceftriaxone (10.3%).
Keywords: Bacillus cereus isolates, antimicrobial agents,
Nigerian Food Journal Vol. 25 (1) 2007: pp.178-183