What is a nine-valent vaccine at 26 years old

The 26-year-old calculation is usually based on the time of the first dose.

The actual age at the time of the first dose is the standard for judging. This is because the vaccination program is strictly regulated. If the first dose is started at the age of 26 or younger, the subsequent injections need to be completed according to the specified time to ensure the best effect

of the vaccine.