Campylobacter jejuni infection is a main source of severe gastroenteritis-related illnesses in humans and there is also evidence that it may be linked to neurological disorders. C. jejuni 81-176 is a virulent strain that has become the global model in the study of mechanisms and pathogenesis of C. jejuni infection. For this reason, we were engaged in studying the fine structures of cell-surface carbohydrate antigens of C. jejuni 81-176, namely, the capsule polysaccharide (CPS) and lipooligosaccharide (LOS). Serologically, C. jejuni 81-176 has been classified as belonging to serogroups HS23 and HS36, and indeed previous studies have shown that the LOS and CPS structures possess components similar to those expressed by serostrains HS23 and HS36. Here, we describe that in addition to the LOS and CPS, this strain also produced an independent cell-surface (1-->4)-alpha-glucan capsule.
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