Each year, between 5% and 20% of Americans get the flu and miss a staggering 70 million work days as a result. The indirect costs? Between $3 billion to $12 billion a year.
Both the flu shot and the nasal flu vaccine work really well to keep you from getting ill. But they aren’t 100% effective. You can still get sick even if you get vaccinated, although it's usually less severe and goes away more quickly.