Comparative population structure analysis of Campylobacter jejuni from human and poultry origin in Bangladesh
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Campylobacter jejuni is the most important cause of antecedent infections leading to Guillain–Barré syndrome (GBS) and Miller Fisher syndrome (MFS). The objective of the present study was to define the genetic diversity, population structure, and potential role of poultry in the transmission of Campylobacter to humans in Bangladesh. We determined the population structure of C. jejuni isolated from poultry (n = 66) and patients with enteritis (n = 39) or GBS (n = 10). Lipooligosaccharide (LOS) typing showed that 50/66 (76 %) C. jejuni strains isolated from poultry could be assigned to one of five LOS locus classes (A–E). The distribution of neuropathy-associated LOS locus classes A, B, and C were 30/50 (60 %) among the typable strains isolated from poultry. The LOS locus classes A, B, and C were significantly associated with GBS and enteritis-related C. jejuni strains more than for the poultry strains [(31/38 (82 %) vs. 30/50 (60 %), p < 0.05]. Multilocus sequence typing (MLST) defined 15 sequence types (STs) and six clonal complexes (CCs) among poultry isolates, including one ST-3740 not previously documented. The most commonly identified type, ST-5 (13/66), in chicken was seen only once among human isolates (1/49) (p < 0.001). Amplified fragment length polymorphism (AFLP) revealed three major clusters (A, B, and C) among C. jejuni isolated from humans and poultry. There seems to be a lack of overlap between the major human and chicken clones, which suggests that there may be additional sources for campylobacteriosis other than poultry in Bangladesh.
KeywordsAmplify Fragment Length Polymorphism Amplify Fragment Length Polymorphism Analysis Campylobacteriosis Miller Fisher Syndrome Amplify Fragment Length Polymorphism Pattern
This research was funded by the Erasmus University Medical Center, Rotterdam, the Netherlands and the International Centre for Diarrheal Disease Research, Dhaka, Bangladesh (ICDDR,B). The ICDDR,B acknowledges with gratitude the commitment of the Government of Bangladesh to the Centre’s research efforts. The ICDDR,B also gratefully acknowledges the following donors which provide unrestricted support to the Centre’s research efforts: Australian Agency for International Development (AusAID), Government of the People’s Republic of Bangladesh, Canadian International Development Agency (CIDA), Swedish International Development Cooperation Agency (Sida), and the Department for International Development (DFID), UK. We are indebted to all the neurologists who referred their patients to us.
Conflict of interest
The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The authors declare that they have no conflict of interest.
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