Vaccination should continue
As long as flu viruses are circulating, vaccination should continue throughout the flu season.(up till end of season)
Centre for Disease control and prevention (CDC) recommends vaccination (flu shots) to begin soon after vaccine becomes available, if possible.
However, as long as flu viruses are circulating, vaccination should continue to be offered throughout the flu season (winter)
While seasonal influenza outbreaks can happen as early as May, during most seasons influenza activity peaks in June or later.
Since it takes about two weeks after vaccination for antibodies to develop in the body that protect against influenza virus infection, it is best that people get vaccinated so
they are protected before influenza begins spreading in their community. Flu vaccine is produced by private manufacturers, and the timing of availability depends on when production is completed.
Why do I need a flu vaccine every year?
A flu vaccine is needed every season for two reasons.
1. First, the body’s immune response from vaccination declines over time, so an annual vaccine is needed for optimal protection.