e5502d32_t_Pandemic_Flu___Public_Health__Pandemic_Flu
[Seasonal Flu] A person can start to spread seasonal flu to others about 1 day before they feel sick, and up to 5 days after becoming sick. [Pandemic Flu] 
Pandemic flu will likely spread similar to seasonal flu, but scientists will investigate how new strains of flu virus spread.
About Pandemic Flu - Public Health
Pandemic Flu