Colds are most contagious for 2-4 days but persists for the duration of time you have symptoms - eviltoast
How Long Should I Stay Home With a Cold or the Flu?
www.webmd.com
If you have a cold or the flu, should you stay home from work or school? WebMD gives you the facts about how long colds and flu last, how long you're contagious, and whether you need to stay home.