第一針應該有效用但係唔能夠好肯定,建議等埋第二針先玩
Frequency of infection was significantly lower in one-dose recipients compared to unvaccinated controls (p < 0.01 for all infection endpoints in each study). HPV16/18 seropositivity rates were high in all HPV vaccine recipients (100% in three of four studies reporting this endpoint), though antibody levels were lower with one compared to two or three doses.
https://www.sciencedirect.com/science/article/pii/S0264410X19316597
One dose of quadrivalent HPV vaccine resulted in increased HPV 6, 11, 16, and 18 GMTs and seropositivity compared with no vaccine at 72 months follow-up (very low certainty evidence).
Results partially adjusted for confounding from four studies indicated that one dose of quadrivalent HPV vaccine may reduce the incidence of genital warts compared with no vaccine, though two studies found little or no difference between one dose and no vaccine (low certainty evidence).
One dose of quadrivalent HPV vaccine may reduce incident HPV infections compared with no vaccine at up to 7 years follow-up (low certainty evidence).
https://www.who.int/immunization/sage/meetings/2019/october/4_._FINAL_One_dose_HPV_vaccine_report_v4.0_20190820.pdf