The flu vaccine is formulated each year to keep up with the flu viruses as they continually change. Multiple studies have shown that the body's immunity to influenza viruses decline over time. Getting vaccinated each year provides the best protection against influenza throughout the season.

Everyone six months and older should get a flu vaccine. It is important that the following people get vaccinated: Those at high risk of developing serious complications like pneumonia if they get sick with the flu. People with medical conditions such as: asthma, diabetes, and chronic lung disease. Pregnant women. People 65 and older Those that live with or care for others who are at high risk of developing serious complications.

CDC recommends that people get vaccinated against influenza as soon as the flu season vaccine becomes available in their community. It takes about two weeks after vaccination for antibodies to develop in the body and provide protection against the flu. Flu vaccine availability depends on when production is completed. If everything goes as indicated by manufacturers, shipments are likely to begin in August. Healthcare providers are encouraged to begin vaccinating as the vaccine become available in their areas.

The timing of flu is very unpredictable and can vary from season to season. Flu commonly peaks in the U.S. in January or February. However, seasonal flu activity can begin as early as October and continue as late as May.

Flu seasons are unpredictable The timing, severity, and length of the flu season depends on many factors, including what influenza viruses are spreading, whether they match the viruses in the vaccine and how many people get vaccinated.