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.
1 Depo-Provera starts working within 24 hours of the first shot if injected within 5 days of beginning a period. 2  Depo-Provera is prescribed by a doctor and given as an injection once every 12 weeks.  You should get your first shot within five days of beginning a period, unless you are presently using the Pill or an IUD.