BORDETELLA
The genus Bordetella
contains seven species. B. pertussis
is by far the most important because it is the cause of classic pertussis
(whooping cough). Nucleic acid homology and other analyses indicate that B. parapertussis and B. bronchiseptica are close enough to B. pertussis to be considered variants
of the same species. B. parapertussis occasionallycauses
a disease similar to, but milder than, pertussis. This is probably because it
does not produce pertussis toxin even though it has a silent copy of the toxin
gene. The remainder of this section will focus solely on B. pertussis.
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