Bordetella pertussis 18323 produces a bvg-regulated 39.1-kDa porin-lik
e protein, OmpQ. OmpQ had 61% similarity to the major porin of B. pert
ussis and contains conserved regions common to both the neisserial and
enteric porin families. The results of Southern blot analysis indicat
e that strains of Bordetella parapertussis and Bordetella bronchisepti
ca but not Bordetella avium contain this gene.