The third and second injections of the nine-valent are given at least four months apart.
Nine-valent vaccine can be injected between the ages of 16 and 26 years old in China. Routinely, three injections are given within six months, with the first, second and third injections being given at month 0, month 2 and month 6 respectively. During the injection period, rest should be taken and contraceptive measures should be taken.
The timing of vaccination may vary due to various social and personal reasons. It should be noted that there is an interval of at least 2 months between the 1st and 2nd injections, and at least 4 months between the 2nd and 3rd injections, indicating that these injections cannot be given earlier than the others, but can be delayed appropriately, but the three injections should be completed within one year without affecting their efficacy.