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m.kidshealth.org/en/teens/contagious.html

Infectious diseases are caused by microscopic germs (such as bacteria or viruses) that get into the body and cause problems. Some — but not all — infectious ...

www.reference.com/health/viruses-contagious-385cdbc6382a900a

Microbe World explains that all viruses are infectious by their nature, but not all viruses are infectious to humans. A virus requires a living host cell in order to ...

diseasea12.imascientist.org.au/2012/09/04/what-makes-a-virus-contagious-or-not

Sep 4, 2012 ... A virus is contagious or not (in a specific host, and a specific environment) because of the way it spreads between hosts. Contagious viruses ...

www.healthline.com/health/cold-flu/contagious

Apr 3, 2017 ... Even if you feel all right, your symptoms — or lack thereof — could be ... The flu is a viral infection caused by the influenza virus that targets your ...

www.nhs.uk/chq/Pages/1068.aspx?CategoryID=67

How long you're infectious after a viral infection depends on the virus that caused the infection. ... a few days before your symptoms appear until all of the symptoms are gone. ... Tonsillitis itself isn't contagious but the viruses that cause it are.

www.virology.ws/2014/10/08/the-incubation-period-of-a-viral-infection

Oct 8, 2014 ... Whether the host is contagious depends on the virus. ... All of these cite viremia in the range of 50,000 to 10 million RNA copies per cc on the ...

wonderopolis.org/wonder/are-all-diseases-contagious

Not all infectious diseases are contagious, however. Instead of being spread from one person to another, some infections can only be spread directly from an ...

www.healthgrades.com/conditions/viral-diseases

Sep 2, 2016 ... Healthgrades logo. © Copyright 2016 Healthgrades Operating Company, Inc. Patent US Nos. 7,752,060 and 8,719,052. All Rights Reserved.

www.theguardian.com/science/occams-corner/2014/apr/22/contagious-cold-microbiological-delusion

Apr 22, 2014 ... It's that strange time of year when, despite springtime breaking out all over town – tulips, apple blossom, sunshine, the works – everyone in the ...