Anaphylactic reaction. Not to be inj IV. Postpone vaccination in patients w/ acute severe febrile illness. Temp ≥40°C; collapse or shock-like state; persistent, inconsolable crying lasting ≥3 hr occurring w/in 48 hr of vaccination; convulsions w/ or w/o fever occurring w/in 3 days of vaccination. Thrombocytopenia or bleeding disorder; history of convulsions, family history of adverse event following vaccination; syncope. Immunosuppressed patients. Pregnancy & lactation. Defer pertussis immunization in childn w/ progressive neurological disorders.