Figure 5: Anti-microbial resistance frequencies of E. coli isolates from broiler roosters. N,
nitrofurantoin; Cf, cefuroxime; Nb, norfloxacin; Co, cotrimoxazole; Gn, gentamicin; Te,
tetracycline; Cp, ciprofloxacin; Na, nalidixic acid; Ch, chloramphenicol; Am, ampicillin.
Anti-microbial Resistance Patterns:
E. coli strains isolated from the various free-range poultry types, demonstrated 29
resistance patterns with NI-CO-TE-NA-CH-AM being the most predominant (Table 1).
This pattern occurred six times and was elucidated from local fowl, old layers,
turkeys and broiler roosters. This was followed by the NI-CO-NA-CH-AM pattern that
occurred five times and in local fowls, free-range cockerels and turkeys. Another
pattern, NI-NB-CO-TE-NA-CH-AM appeared four times and was observed in old layers
and broiler roosters. It was also noted that most of the resistance patterns contained
from 5 to 8 antibiotics indicating multi-drug resistance among the organisms.
OJHAS Vol 4 Issue 3, 2005-3-3: Original Article. Antimicrobial resistance profile of E.coli isolates from tropical free range chickens. www.ojhas.org/issue15/2005-3-3.htm
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