4 definitions of HPR. Definition of HPR in Business & Finance. What does HPR stand for?
According to the Centers for Disease Control (CDC), you should allow two weeks after getting a flu shot to develop protection against the flu. That's because after vaccination, the body has to work for a while to create the protective antibodies to the flu virus. Bear in mind, though, that there's a lot of variation in how fast different people's immune systems work.
According to the CDC, in past flu seasons when the match between the flu vaccine and circulating strains of flu virus is close, a flu shot is 40 to 60 percent effective in reducing the risk of getting influenza among people of all ages.