HPV vaccinations generally require three injections, with the second injection 1-2 months after the first, and the third injection at least six months after the first or more than 4 months after the second. It is up to the doctor to decide whether or not to get the third shot, and generally women ages 9-14 can get only two shots. If only two injections are given, the interval between the second HPV vaccination must be 6-12 months after the first injection, so there are differences in the interval between HPV vaccinations, and the interval differs for different groups of people and different number of injections, and patients have to grasp it on their own. If the vaccination procedure is interrupted during these three injections, there is no need to restart the first HPV vaccination. In general, women can be vaccinated during their menstrual period, and minor colds and minor infections do not affect the vaccination. The vaccination is usually given by intramuscular injection, and the preferred site for vaccination is the deltoid muscle of the upper arm.