Jn. Ombui et al., FREQUENCY OF ANTIMICROBIAL RESISTANCE AND PLASMID PROFILES OF BACILLUS-CEREUS STRAINS ISOLATED FROM MILK, East African medical journal, 73(6), 1996, pp. 380-384
Plasmid profile analysis and susceptibility to eight commonly used ant
imicrobial agents was done on sixty Bacillus cereus (B. cereus) strain
s isolated from milk. About seventy two percent (71.7%) of the isolate
s contained plasmids. The number of plasmids per isolate ranged betwee
n 1 and 5, while plasmid sizes ranged between 60 and 0.1 megadaltons (
Mda), All isolates were resistant to ampicillin with a relatively high
rate of resistance to cotrimoxazole and sulphamethoxazole. The isolat
es showed a low frequency of resistance to the other antimicrobial age
nts, with all of them being susceptible to streptomycin. Approximately
ninety one (90.7%) percent of the isolates showed multiple resistance
, There was no apparent relationship between carriage of plasmids and
drug resistance.