The flu is a common seasonal illness that affects millions of people each year. While many individuals focus on symptom relief, understanding how contagious the flu is and how long it can spread is just as important. Knowing when you are most contagious helps protect family members, coworkers, and the broader community, while also guiding decisions about work, school, and social activities. Influenza is caused by a virus that spreads easily, especially during fall and winter months. Even...

