Pathogen: Bordetella pertussis

Indication	First Choice	Alternatives
Immunization against pertussis for adult or pediatric HCT recipients	Acellular pertussis vaccine • Initial dose at 6-12 months post-HCT • A total of 3 doses should be given at least 1 month apart	Azithromycin orally daily for persons with incomplete vaccination series Adults and adolescents: 250 mg Pediatrics: 5 mg/kg daily
Postexposure prophylaxis for adult or pediatric HCT recipients, regardless of vaccination status	Azithromycin: Adults and adolescents: 500 mg for 1 day then 250 mg daily for 4 days Pediatrics: 10 mg/kg loading dose then 5 mg/kg daily for 4 days