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BIO220H1 (244)
Locke Rowe (26)
Lecture

Winter 2012 BIO220H1 Lecture 8

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Department
Biology
Course
BIO220H1
Professor
Locke Rowe
Semester
Winter

Description
Bio220 Lec 8Virulence y Influenzanot knownwhy the strain in 1918 was so virulent y Ebola y Common Coldy Roy AndersonRobert May Parasite Adaptation Hypothesiso Parasite replication rate in host causes level of virulence o ParRep Rate evolves to max Parasite transmissionspread o Parasite gen Time is short parasite evolution in absence of host coevolutiony Pathogens maximizeof new infections o of new infectionsday days infection lasts o Trade off increased virulence increases transmission however this decreases host longevity High transmission means you will kill your host too fasthost mortality y Most virulent strains increase transmission rate but kills host quickly y Least virulent strains tend to be cleared by the host quickly y Predictionstrains of
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