1. Here's why doctors urge people to get the flu shot every year  NBC News
  2. Doctors say flu season is only going to get worse -- here's why  
  3. View full coverage on Google News
Why do you need a flu shot? The CDC recommends a flu shot every flu season, because the virus strains mutate and protection fades away. When flu season rolls around, you need to get a new flu shot. No matter what.