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:Slovak term: [[Slovenský termín]]
# A sub-microscopic infectious agent that is unable to grow or reproduce outside a host cell (WHO 2009).
# A minute organism not visible by light microscopy (Symons et al. 2000).
# See also : [[Infectious disease]].

==Explanation==
A virus is an obligate parasite dependent on nutrients inside cells for its metabolic and
reproductive needs. It consist of a strand of either DNA or RNA, but not both, separated by
a protein covering called a capsid (Symons etal. 2000).

Viruses consist of two or three parts : all viruses have genes made from either DNA or RNA
(but not both), long molecules that carry genetic information; all have a protein coat called
a capsid that protects these genes; and some have an envelope of fat that surrounds them
when they are outside a cell. They are about 100 times smaller than bacteria (WHO 2009).

==Example==
A range of disease are caused by infections with viruses, ranging from influenza and
measles to yellow fever, dengue and various forms of encephalitis (WHO 2009).

==References==
* Symons JM, Bradley LC and Cleveland TC (2000) The drinking water dictionary, American Water Works Association.
* WHO(2009) Health impact assessment glossary: E-learning modules.

==Links==
* [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]

[[Category:EN]]

@@ Riadok 1: / Riadok 1: @@
 :Slovak term: [[Slovenský termín]]
 # A sub-microscopic infectious agent that is unable to grow or reproduce outside a host cell (WHO 2009).
 # A minute organism not visible by light microscopy (Symons et al. 2000).

Virus - História úprav

Vrut na 13:41, 22. september 2014

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