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Thermo-tolerant Campylobacter fetus bacteraemia identified by 16S ribosomal RNA gene sequencing: an emerging pathogen in immunocompromised patients

Department of Microbiology, University of Hong Kong, Queen Mary Hospital and HKU-Pasteur Research Center, Hong Kong

Corresponding author: Dr K-Y. Yuen (e-mail: hkumicro{at}hkucc.hku.hk).

Received 25 Jan. 2002; revised version accepted 15 April 2002.

Abstract

Eight Campylobacter isolates that were able to grow at 25°C and 42°C and had the same biochemical profile were isolated from the blood of eight immunocompromised patients. Conventional biochemical tests were unable to determine whether they were isolates of thermo-tolerant C. fetus, H₂S-negative C. hyointestinalis, or a new Campylobacter species. Sequencing of the 16S ribosomal RNA genes showed that all eight isolates had the same nucleotide sequence and this was identical to that of C. fetus (GenBank accession no. AF219233). All eight patients had underlying disease and two died despite antibiotic treatment. Because of the ability of C. fetus to grow over a wide range of temperatures and a higher incidence of bacteraemia by this organism than C. jejuni in the past 5 years in Hong Kong, thermo-tolerant C. fetus may be an emerging pathogen in immunocompromised patients in the years to come.

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