Household spread of infection due to Haemophilus influenzae type b.
D002648:Child; D002675:Child, Preschool; D003141:Communicable Diseases / Q000209:etiology; D004200:Diseases in Twins; D004825:Epiglottis; D005260:Female; D006192:Haemophilus Infections / Q000235:genetics / Q000635:transmission*; D006193:Haemophilus influenzae; D006801:Humans; D007223:Infant; D007827:Laryngitis / Q000209:etiology; D008297:Male; D008583:Meningitis, Haemophilus / Q000635:transmission; D012306:Risk