![]() holmesii autoagglutinating strains, ATCC 51541 and ATCC 700053, which exhibit transcriptional down-regulation of bipA gene expression, indicating that autoagglutination indirectly inhibits biofilm formation. ![]() Moreover, the BipA mutant adhered poorly to an abiotic surface and failed to form biofilms, as did two other B. A BipA-deficient mutant generated by homologous recombination also exhibited the autoagglutination phenotype. holmesii isolate that forms large aggregates and precipitates in suspension, and subsequently demonstrated that the autoagglutinating isolate is deficient in Bordetella intermediate protein A (BipA) and that this deletion is caused by a frame-shift mutation in the bipA gene. holmesii infection has increased in the last decade worldwide, little is known about the virulence factors of the organism. Although the number of cases of pertussis-like respiratory illnesses due to B. Bordetella holmesii causes both invasive and respiratory diseases in humans.
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