Recent developments in childhood immunizations.
D002644:Chickenpox / Q000517:prevention & control*; D002648:Child; D002675:Child, Preschool; D006192:Haemophilus Infections / Q000517:prevention & control*; D006193:Haemophilus influenzae; D006509:Hepatitis B / Q000517:prevention & control*; D006801:Humans; D007223:Infant; D014611:Vaccination; D014917:Whooping Cough / Q000517:prevention & control*