The
immune system will use the most effective mechanisms depending on the characteristics of the
infectious agents. Different actions take place during viral infections,
both towards free viral
particles as well as towards infected cells.
This is so because, Viruses need the cell machinery in
order to produce their own proteins. They are intracellular parasites that can only replicate inside
cells. Viruses usually are made of very simple structures, consisting
of proteins and nucleic
acid, even though their structure and composition is quite variable.They fall into two distinct
groups, depending on their nucleic acid: DNA and RNA viruses. They are grouped in different
families by their morphology and structure.
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