In medicine, infectious disease or communicable disease is disease caused by a biological agent such as by a virus, bacterium or parasite. This is contrasted to physical causes, such as burns or chemical ones such as through intoxication.

Basics

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Infectious diseases are the invasion of a host organism by a foreign replicator, generally microorganisms, often called microbes, that are invisible to the naked eye. Microbes that cause illness are also known as pathogens. The most common pathogens are various bacteria and viruses, though a number of other microorganisms, including some kinds of fungi and protozoa, also cause disease. Prions are borderline, and memes would not usually be considered in this scope. An infectious disease is termed contagious if it is easily transmitted from one person to another.

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RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, http://bit.ly/8H1WmM
marynmck (Maryn McKenna) Wed, 06 Jan 2010 00:12:07 -0000
RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, http://bit.ly/8H1WmM
RT @AutismTips: It's not infectious diseases that parents are concerned about. They are concerned about autism.- Barbara Fisher
profiv (marinconi vasile) Tue, 05 Jan 2010 23:58:30 -0000
RT @AutismTips: It's not infectious diseases that parents are concerned about. They are concerned about autism.- Barbara Fisher
@Miss_GK I might try & find my infectious diseases doctor friend @ lunchtime..
sairbear (sairbear) Tue, 05 Jan 2010 23:58:26 -0000
@Miss_GK I might try & find my infectious diseases doctor friend @ lunchtime..
@TaNnAsWoNdrLnD the various causes of infectious diseases haha
dazednfazed (John Tesoro) Tue, 05 Jan 2010 23:58:17 -0000
@TaNnAsWoNdrLnD the various causes of infectious diseases haha
RT @sybilkk: RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, htt ...
emilynora (Emily Schwartz) Tue, 05 Jan 2010 23:16:38 -0000
RT @sybilkk: RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, htt ...
RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, http://bit.ly/8H1WmM
sybilkk (Sybil Wartenberg) Tue, 05 Jan 2010 23:13:02 -0000
RT @LizSzabo: USA TODAY: Moms who lost children to infectious diseases say need 4 vaccination is as great 2day as ever, http://bit.ly/8H1WmM

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