ECOL 302 Lecture Notes - Lecture 20: Vertically Transmitted Infection, Compartmental Models In Epidemiology
21 Nov 2014
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Must get from host to host, otherwise they go extinct when the host dies a) b) c) Horizontal transmission: movement of pathogens between 2 free- living host: persist longer in large, dense populations b/c more chance of successful spread & more not- yet infected individuals. > guam is an outlier = has influx of people b/c military base: should often show pop cycles b/c host behavior changes & vector and path survivorship vary w/ climate i) ii) Vector- mediated (vector is a briefly infected species that moves pathogen between hosts) Vertical transmission: baby born with the pathogen/ internal movement of pathogen from mother to offspring very few pathogens exclusively vertically transmitted: doesn"t persist longer like horizontal transmission. First realize nat selection acts on both partners just as in predator/prey interactions a) A well adapted host leaves more offspring than a b. Evolutionary principles help predict i. ii. which diseases are most severe.
