the rule of thumb is that [you are no longer contagious] when you do not have a fever for more than 24 hours and did not take any medications to help reduce the fever. when you don't have a fever your not contagious according to the u. s. cdc: "most healthy adults may be able to infect others 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. 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. some persons can be infected with the flu virus but have no symptoms. during this time those persons may still spread the virus to others. " according to the center for disease control you are contagious for 1-4 days before you ever become sick with the flu so if you are not running fever but are still contagious before the fever comes then how can you still not be contagious for at least 5 days after you stop having fever? evidently the flu doesnt need fever to be contagious in the beginning. after fever subsides
when is the flu no longer contagious?