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.
Some older people and people with certain medical conditions may develop less immunity after receiving a flu shot. 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.