The differential host species specificities of Bordetella pertussis, B. parapertussis, and B. bronchiseptica might be explained by polymorphisms in adherence factor genes. We have found that B. parapertussis and B. bronchiseptica, unlike B. pertussis, contain a full-length gene for the fimbrial subunit FimA. B. bronchiseptica expresses fimA in a BvgAS-dependent fashion.
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Boschwitz et al. (1997) studied this question.
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