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Host invasion by microorganisms (view source)

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==Replication==

[[Image:Viral replication.jpg|thumb|right|150px|Viral Replication - B. Catchpole, RVC 2008]]

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Viral lifespans have three distinct phases:

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*Infectious (extracellular): as they seek out a host target

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*Replicative (intracellular): as they overtake the host cell's utilities to multiply

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*Dissemination (extracellular): as they leave the host cell and migrate to those surrounding

==Routes of infection==

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