Abstract Helicobacter fennelliae (H. fennelliae) is associated with human gastroenteritis; however, H. fennelliae was isolated and confirmed by phenotypic and genotypic identification from a non-diarrheal child stool sample in Cambodia. Antimicrobial susceptibility testing demonstrated that this isolate had a high minimal inhibitory concentration against macrolides and quinolones, which are first-line antibiotic treatment choices for Campylobacter infections. Consequently, macrolides and quinolones were likewise expected to be ineffective against Campylobacter-like organisms such as H. fennelliae. This isolate warranted further genetic characterization to better understand associated antibiotic resistance mechanisms. Resistant pathogens from asymptomatic diarrheal cases are likely underestimated, and as such colonized individuals may spread resistant organisms to local community members and the environment.
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