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What Causes Colds? According to the US Centers for Disease Control and Prevention (CDC), "flu viruses spread mainly from person to person through coughing or sneezing of people with influenza. Sometimes people may become infected by touching something with flu viruses on it and then touching their mouth or nose. Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 days after becoming sick. That means that you may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick."
Sources:
Tell the difference between colds and flu and discover the best treatments for each >>
1) US Center for Disease Control and Prevention (CDC). For more information visit http://www.cdc.gov/flu/about/qa/ and http://www.cdc.gov/flu/keyfacts.htm. 2) S.A. Boone, “The Occurrence of Influenza A virus on Household and Day Care Center Fomites”, C.P. Gerba, Journal of Infection, 2004.
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![]() The Centers for Disease Control and Prevention (CDC) is one of the 13 major operating components of the Department of Health and Human Services (HHS), which is the principal agency in the United States government for protecting the health and safety of all Americans and for providing essential human services, especially for those people who are least able to help themselves. |





