Prevalence and antibiogram profiles of Escherichia coli O157:H7 isolates recovered from three selected dairy farms in the Eastern Cape Province, South Africa

Journal Title: Asian Pacific Journal of Tropical Disease - Year 2016, Vol 6, Issue 12

Abstract

Objective: To investigate the occurrence and antibiotics susceptibility of Escherichia coli (E. coli) O157:H7 isolates from raw milk, cattle udder, milking machines and worker’s hand swabs from three selected commercial dairy farms in the Amathole District Municipality, Eastern Cape Province, South Africa. Methods: Raw milk samples were collected from bulk storage tanks and swab samples were collected from milking machines, cattle udders and worker’s hands fortnightly over a sixmonth sampling regime between June and November 2014. A standard culture-based method was used for the enumeration and isolation of E. coli O157:H7, presumptive identification using sorbitol MacConkey agar (supplemented with cefixime (50 µg/L) and potassium tellurite (25 mg/L). A serological confirmation of the presumptive E. coli O157:H7 isolates was conducted using the O157 latex agglutination test kit. Results: A total of 252 E. coli O157:H7 isolates were further subjected to PCR amplification of rfbEO157 and flCH7 genes of which 27(11%) of the isolates were confirmed positive E. coli O157:H7. The percentage antibiotic resistance of the 27 E. coli O157:H7 isolates from the dairy farms revealed penicillin [23 (85%)], tetracycline [22 (81%)], erythromycin [19 (70%)], streptomycin [14 (52%)] and chloramphenicol [12 (45%)]. The highest resistances were penicillin [23 (85%)] and tetracycline [22 (81%)]. Conclusions: These findings revealed that the dairy farms are potential reservoirs of E. coli O157:H7 serotype, and harbor antibiotic-resistant determinants, a concern to public and environmental health.

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  • EP ID EP227023
  • DOI 10.1016/S2222-1808(16)61170-2
  • Views 64
  • Downloads 0

How To Cite

(2016). Prevalence and antibiogram profiles of Escherichia coli O157:H7 isolates recovered from three selected dairy farms in the Eastern Cape Province, South Africa. Asian Pacific Journal of Tropical Disease, 6(12), 990-995. https://europub.co.uk/articles/-A-227023