Parasites and their Virulence ABSTRACT Why do some parasites charge the host they depend upon while others coexist with their host? cardinal prime factors determine parasitic virulence: the manner in which the parasite is transmitted, and the evolutionary history of the parasite and its host. Parasites which have telephone extension a new host species pitch to be oft virulent than parasites which have coevolved with their hosts. Parasites which are transmitted horizontally lean to be more virulent than those transmitted vertically. It has been assumed that parasite-host interactions ineluctably evolve toward lower virulence. This is contradicted by studies in which virulence is confirm or increases over time. A model which encompasses the variability of parasite-host interactions by synthesizing spatial (transmission) and temporal (evolutionary) factors is examined. Lenski an d May (1994) and Antia et al. (1993) predict the modulation o...If you want to get a full essay, order it on our website: BestEssayCheap.com
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