Under what conditions will a parasite (or pathogen) evolve to be more harmful (or less harmful) to its host?

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Topic:Under what conditions will a parasite (or pathogen) evolve to be more harmful (or less harmful) to its host? Discuss both theory and evidence
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English:US
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Details:Under what conditions will a parasite (or pathogen) evolve to be more harmful (or less harmful) to its host? Discuss both theory and evidence. — horizontal and vertical transmission and host-parasite co-evolution

Great! Also this is the reference to article I cited in the beginning of the paper if needed. http://www.ped.fas.harvard.edu/people/faculty/publications_nowak/Evol96a.pdf — Titled: The Evolution of Virulence in Pathogens with Vertical and Horizontal Transmission by M. Lipsitch