Influenza Vaccine (Flu Shot and Nasal Spray) for Adults
The influenza vaccine is a yearly vaccine that protects you from getting the flu, a viral respiratory illness that spreads very easily. The flu can lead to serious health complications and possibly death.
Flu shot: The flu shot is typically given to adults in a muscle in the upper arm. It is an inactive vaccine, which means it is made using dead bacteria. The dead germs cannot make you sick.
Nasal spray: The nasal spray flu vaccine is a live attenuated influence vaccine, or LAIV. Unlike the flu shot, it is made from live, but weakened, influenza viruses. However, you cannot get the flu from the nasal spray vaccine. Only certain adults under age 50 may receive the nasal spray.
The three or four flu strains covered by the flu vaccine differ from year to year. That’s because the flu viruses are constantly changing. Scientists develop a new flu vaccine each season based on research that predicts which strains will be most likely to make you sick.
When Should Adults Be Vaccinated?
Flu seasons also vary, depending on where you live. Flu season can run from October to May. You should get vaccinated as soon as the vaccine becomes available. It takes about two weeks for the flu vaccine to start working, so you want to make sure you are fully protected as soon as possible. Generally, the seasonal flu vaccine is available from September until spring.
Which Adults Should Get a Flu Vaccine?
The CDC recommends that adults receive a flu vaccine every year, especially those who are at high risk for developing flu-related complications and those who care for or live with such people, such as health care workers.
You are more likely to develop serious flu-related complications and should get a flu vaccine if you have:
Asthma (even if it's mild or controlled) or other lung disease