Key Facts About Seasonal Flu Vaccine:
See what the CDC has to say -- click here
Note: For the 2016-2017 season, CDC recommends use of the flu shot (inactivated influenza vaccine or IIV) and the recombinant influenza vaccine (RIV). The nasal spray flu vaccine (live attenuated influenza vaccine or LAIV) should not be used during 2016-2017. The 2016-2017 influenza vaccination recommendations are now available.
Influenza (also known as the flu) is a contagious respiratory illness caused by flu viruses. It can cause mild to severe illness, and at times can lead to death. The flu is different from a cold. The flu usually comes on suddenly. People who have the flu often feel some or all of these symptoms:
Fever* or feeling feverish/chills
Runny or stuffy nose
Muscle or body aches
Some people may have vomiting and diarrhea, though this is more common in children than adults.
* It's important to note that not everyone with flu will have a fever.