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Characterization of cytotoxic necrotizing factor 1-producing Escherichia coli strains from faeces of healthy macaques

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA, USA

Correspondence
James G. Fox
jgfox{at}mit.edu

Received April 18, 2009
Accepted June 10, 2009

Twenty-five (27 %) of 92 clinically normal macaques were found to have β-haemolytic Escherichia coli isolated from their faeces. Five of six isolates chosen for further characterization had multiple antibiotic resistance and were PCR-positive for cytotoxic necrotizing factor 1 (cnf1) with a demonstrated cytopathic effect in vitro. By repetitive element sequence-based PCR genotyping, genetic similarity was established for selected isolates. We believe this to be the first report of E. coli strains producing CNF1 in non-human primates.