You Can Spread the Flu Even If You Don't Get Sick
According to Harvard School of Public Health, 20 to 30 percent of people who carry the influenza virus never experience flulike symptoms. Yet it's still contagious. "Young, healthy people especially need to get vaccinated because they often get infected and never know it," Schaffner says. "Either their symptoms are mild or they have none at all, so they're out there inadvertently spreading the virus to others — girlfriends, coworkers, even people at gym." If any of those people have a weaker immune system than you — or if they're simply not as lucky — they could get hit hard with symptoms even though you never did. "No one wants to be a flu spreader," Schaffner says. "Get vaccinated and be a flu preventer instead."