Parasites And Their Virulence

Parasites and their Virulence ABSTRACT Why do some parasites defeat the host they depend upon while others coexist with their host? two 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 annex a new host species pitch to be much virulent than parasites which have coevolved with their hosts. Parasites which are transmitted horizontally tend to be more virulent than those transmitted vertically.

It has been assumed that parasite-host interactions unavoidably evolve toward lower virulence. This is contradicted by studies in which virulence is keep 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 and May (1994) and Antia et al. (1993) predict the modulation o...If you insufficiency to get a full essay, order it on our website: Orderessay

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