CRAIG, J P Diphtheria: prevalence of inapparent infection in a nonepidemic period. [electronic resource] - American journal of public health and the nation's health Sep 1962 - 1444-52 p. digital Publication Type: Journal Article ISSN: 0002-9572 Standard No.: 10.2105/ajph.52.9.1444 doi Subjects--Topical Terms: Asymptomatic InfectionsDiphtheria--immunologyPrevalence