Diagnosis
HPV vaccine protects vaccinated and unvaccinated women, study finds

A large, long-term study has found that the introduction of the human papillomavirus (HPV) vaccine in community settings is highly effective in protecting young women from infections caused by the cervical-cancer-causing virus—including women who didn’t even receive the vaccine.
HPV is the most common sexually transmitted infection worldwide and is the primary cause of cervical cancer.
HPV also causes other genital cancers as well as head and neck cancers in both women and men. According to the International Agency for Research on Cancer, HPV is responsible for more than 690,000 new cancer cases each year—about 4.5 per cent of all cancers globally.
Lead author Jessica Kahn, M.D., M.P.H. is professor of paediatrics and the Dr Ernest Baden Chair in Head and Neck Pathology at Einstein.
She said: “There are two encouraging takeaways from our study.
“First, HPV vaccines work remarkably well in a real-world setting, even among women at high risk for HPV and who may not have received all vaccine doses.
“Second, we saw clear evidence of herd immunity, meaning when enough people are vaccinated, the vaccine indirectly protects unvaccinated people by reducing overall virus transmission.
“These results reinforce the potential of the HPV vaccine to prevent infection and, ultimately, eliminate cervical cancer globally.”
The research team conducted six studies in Cincinnati of 2,335 adolescent and young adult women between 2006—just before the first HPV vaccine became available—and 2023.
Participants ranged in age from 13 to 26 at enrolment.
Many reported sexual behaviours that increased risk for HPV (79 per cent had two or more male sexual partners) and 51 per cent had a history of at least one sexually transmitted infection.
Over the 17-year study period, HPV vaccination rates rose from 0 per cent to 82 per cent. As vaccination coverage increased, the rates of HPV infection dropped dramatically among vaccinated participants
Infections from HPV types covered by the 2-valent vaccine fell by 98.4 per cent
Infections from types covered by the 4-valent vaccine dropped by 94.2 per cent
Infections from types covered by the 9-valent vaccine declined by 75.7 per cent
“These outcomes show that HPV vaccines are highly effective outside of controlled trials and could dramatically reduce rates of cervical cancer and other HPV-caused cancers, including other genital cancers and head and neck cancers,” said Dr Kahn.
The researchers also found strong evidence of herd immunity.
Among unvaccinated women, infections with HPV types covered by the 2-valent vaccine decreased by 71.6 per cent.
Meanwhile, infections with HPV types covered by the 4-valent vaccine dropped by 75.8 per cent
Dr Kahn noted that the high degree of herd immunity was likely related to robust vaccination rates and vaccination of boys as well as girls.
While there wasn’t enough data yet to confirm herd protection from the more recently introduced 9-valent vaccine, the results are promising.
“In the U.S. and other countries with widespread HPV vaccination programs, cervical cancer rates are already declining,” Dr Kahn said.
“Yet in 42 countries, it remains the leading cause of cancer death among women.
“Globally, only 27 per cent of girls have received at least one dose of this lifesaving vaccine – with coverage ranging from just 1 per cent in the Eastern Mediterranean region to 68 per cent in the Americas.
“By expanding uptake of this highly safe and effective vaccine, and ensuring access to screening and treatment, we can achieve one of the greatest public health victories of our time: the elimination of cervical cancer worldwide.”
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