Quote:
Originally Posted by LeatherTrumpet
but isnt the time that they are infectious prior to physical symptoms ?
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Nope.
The Flu Is Contagious. Most healthy adults may be able to infect other people beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick. Children may pass the virus for longer than 7 days. Symptoms start 1 to 4 days after the virus enters the body.
http://www.cdc.gov/flu/about/disease/spread.htm