= Herbert W. Hethcote
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<Herbert W. Hethcote> developed mathematical models of infectious-disease transmission. His University of Iowa research history emphasizes the interaction between infectious and susceptible populations.https://now.uiowa.edu/news/2021/03/research-mathematics-professor-emeritus-surges-during-pandemic[Institutional account of his mathematical epidemiology research]{ref}
His <The Mathematics of Infectious Diseases by Herbert W. Hethcote> brings together models, thresholds and their assumptions. In a constant-population <SIS model>, recovery returns individuals to susceptibility; the infectious fraction satisfies a scalar nonlinear equation whose equilibria reveal an invasion threshold. The example shows how a biological transition diagram becomes a <differential equation> and then a stability question.<The Mathematics of Infectious Diseases by Herbert W. Hethcote>[Section 3, p. 621, SIS reduction]{ref}
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