ZMYM2 and pertussis: This conclusion likely holds true also for B. pertussis transmission between humans, as by difference to massive expansion of pertactin-deficient isolates under the pressure of the acellular pertussis vaccine, FhaB-deficient isolates are isolated extremely rarely [89–91] and to the best of our knowledge, Fim-deficient clinical isolates of B. pertussis have not been reported at all.