Measles in children under six months of age: an epidemiological study.
D002675:Child, Preschool; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008457:Measles / Q000453:epidemiology*; D011247:Pregnancy; D012959:Socioeconomic Factors