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What is the maximum interval between the second needle and the third needle of tetravalent?

The interval is within 12 months.

China Center for Disease Control and Prevention China Vaccine and Immunization official website showed that according to the vaccine instructions, the recommended interval between the second dose and the third dose of tetravalent HPV vaccine was 4 months, and the longest time was no more than 12 months. The interval of more than 12 months will affect the immune effect of the vaccine.

The tetravalent human papillomavirus vaccine is suitable for women aged 20-45, and needs three injections, which are inoculated at 0, 2 and 6 months respectively.