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Category:Viruses (view source)

Revision as of 12:56, 17 May 2010

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==Introduction==

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.'

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==[[Viral Structure]]==

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[[Viral Structure]]

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~~==Pathogenesis==~~

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~~Viruses bind to host cells via specific receptors, partly determining which cell types become infected:~~

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~~{| border="1" cellpadding="2"~~

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~~!width="50"|Virus~~

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~~!width="225"|Receptor~~

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~~!width="225"|Cell type infected~~

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~~|HIV || CD4|| Helper T cells~~

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~~|Epstein-Barr virus|| Complement receptor (type-2)|| B cells~~

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~~|Influenza A virus|| Glycophorin A|| Many cell types~~

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~~|Polio virus|| Polio virus receptor|| Neurons~~

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~~Examples of pathogenesis of viruses:~~

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[[Viral Pathogenesis]]

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*'''Fifth disease''': caused by parvovirus B19, characterised by 'slapped cheek' rash

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*'''Verruca vulgaris''': caused by human papillomaviruses-1, -2 and -3

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*'''Cervical cancer''': caused by human papillomaviruses-16 and -18

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*'''Acute respiratory disease''': caused by adenoviruses -3, -4 and -7. Symptoms include flu-like fever, headache and chills

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*'''Cytomegalovirus''': caused by a type of herpesvirus, CMV is the most common viral infection found in infants

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*'''Smallpox''': caused by a type of poxvirus

==Replication==

Bara

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