Abstract
Seventy strains of Staphylococcus spp. and Escherichia coli (35 each) were isolated from various foodstuffs and identified on the basis of cultural, morphological and biochemical characteristics and were further tested for their antibiotic susceptibility with commonly used antibiotics/drugs. 69.2% of the strains of Staphylococci were resistant to co-trimazine and 34.6% were resistant to penicillin-G. 19.2% of the staphylococcal isolates exhibited resistance to cloxacillin, nalidixic acid, methicillin and tetracycline whereas 15.3% of the staphylococcal isolates were resistant to amoxycillin and nitrofurantoin. The isolated E. coli strains exhibited sharp peaks of resistance to antimicrobial agents such as tetracycline (72%), doxycycline (60%) and nalidixic acid (48%). Forty-four percent of the E. coli strains were resistant to nitrofurantoin and penicillin-G respectively. Among the 13 antibiotics/drugs tested for resistance, six different resistance patterns were observed in staphylococcal isolates and seven different resistance patterns were observed in the E. coli isolates from various foodstuffs. Bacterial strains exhibiting MIC values ≥100 μg/ml for ampicillin and cloxacillin were screened for β-lactamase activity and out of 10 staphylococcal isolates, seven were found to be positive for β-lactamase, whereas out of 13 E. coli isolates tested for β-lactamase production, only three were found to be positive.
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Khan, M.K.R., Malik, A. Antibiotic resistance and detection of β-lactamase in bacterial strains of Staphylococci and Escherichia coli isolated from foodstuffs. World Journal of Microbiology and Biotechnology 17, 863–868 (2001). https://doi.org/10.1023/A:1013857101177
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DOI: https://doi.org/10.1023/A:1013857101177