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Viruses are very simple organisms that rely on the host cell's biochemical machinery for sugar metabolism and protein synthesis- they are commonly described as 'obligate intracellular parasites.'

Viruses are very simple organisms that rely on the host cell's biochemical machinery for sugar metabolism and protein synthesis- they are commonly described as 'obligate intracellular parasites.'

[[Viral Structure]]

<big>'''[[Viral Structure]]

[[Viral Pathogenesis]]

'''[[Viral Pathogenesis]]

'''[[Viral Replication]]

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