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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 ...

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.

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.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 ...

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.health.harvard.edu/diseases-and-conditions/respiratory-tract-infection-is-it-contagious-the-family-healthguide

Jan 23, 2017 ... A medical review published in the New England Journal of Medicine tells us when to exercise concern over eight respiratory tract infections.

www.mayoclinic.org/diseases-conditions/infectious-diseases/expert-answers/infectious-disease/faq-20058098

As you might think, bacterial infections are caused by bacteria, and viral infections are caused by viruses. Perhaps the most important distinction between  ...