[Epidemiology of pertussis in Leningrad in recent years].
D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D013997:Time Factors; D014586:USSR; D014917:Whooping Cough / Q000453:epidemiology* / Q000276:immunology
Materialy apidemiologii kokliusha v leningrade v poslednie gody