BIO120H1 Lecture Notes - Lecture 19: Commensalism, Antibody, Introduced Species
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BIO120H1 Full Course Notes
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On populations, virulence can reduce the overall fitness of a population. A disease model by roy anderson establishes three components to disease ecology. For disease growth, b refers to transmission rate, and divide it by the recovery rate gives the spreading rate. An epidemic occurs if this ro is greater than 1. A vaccination essentially slows down this infection rate by decreasing the amount of susceptible people. Vaccination is quite difficult since it is hard to eradicate a sufficient amount of individuals and reduce it to less than an ro of 1. In colonial birds such as swallows, parasites tend to be frequent because of communal nests. After spraying nests with fumigations that will kill off parasites, the average number of offspring increase from 7 to 9. Seroprevalence is the existence of antibodies in one"s blood, and the seroprevelence among.
