HPV 51 Positive at Age 55: How Dangerous Is It? Risk Versus HPV 16/18, Why It Shows Up After Menopause, Next Steps and Warning Signs

From an HPV support group: HPV 51 found at age 55, is it dangerous?

Short answer: this result is not cancer, and HPV 51 is one of the lowest-risk high-risk types. It should not be ignored, though, because at this age what determines risk is how long the virus persists, so repeat testing on schedule matters.

A member of an HPV support group shared that her cervical screening found HPV type 51 at age 55 and that she was very worried about how dangerous it is. This article summarizes how risky this type is compared with others, why it is found after menopause, the next steps and the symptoms that should not wait. It does not know her Pap result or history, so it does not replace an examination by a gynecologist.

1. How dangerous is HPV 51 compared with other types?

Short answer: HPV 51 is a cancer-causing type, but among the 12 high-risk types it sits in the group with the lowest chance of precancer, and it is found in cervical cancers far less often than HPV 16 and 18.

Classified as a Group 1 carcinogen

The International Agency for Research on Cancer (IARC, 2009)
classifies 12 HPV types, 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58 and 59, as Group 1 carcinogens for the cervix. HPV 51 is therefore genuinely high-risk, but being in the same group does not mean equal risk.

Risk differs greatly by type

A study following 11,573 women aged 30–65 (14,158 infections) by
Demarco and colleagues (2020)
split the 7-year risk of CIN3 or worse into 4 tiers, shown in the chart. HPV 51 is in the lowest tier, and the study found that age did not change risk much; what mattered was how long the infection persisted.

Bar length is approximate illustration; the figures are the 7-year chance of CIN3 or worse from the study, not an individual prediction.

How often is HPV 51 found in cervical cancer?

A study of 10,575 cervical cancer samples from 38 countries
(de Sanjosé 2010)
found HPV 16 or 18 in 71%, and 8 types, 16, 18, 31, 33, 35, 45, 52 and 58, together in about 91%. HPV 51 is not among these 8.
However, cancers caused by types other than 16, 18 and 45 were diagnosed at an older average age (55.5 years versus 50.0 years for HPV 16), which is why women aged 55 should not skip follow-up.

Risk and action by type group (shown as cards on mobile).

2. Why is it found only now at 55, and how is this age different?

Short answer: at this age most newly detected HPV comes from old, dormant virus becoming detectable again rather than a new infection, so a positive result is not evidence that a partner was unfaithful.

Dormant virus can become detectable again

A study of 700 women aged 35–60
(Rositch 2012)
found that 85% (155 of 183) of newly detected infections occurred during periods of monogamy or no sexual activity, and only 13% could be explained by new partners.
Another study of 843 women
(Gravitt 2013)
found that at ages 50–60 a new partner explained only about 7.7% of detections, compared with 28% at ages 35–49. The researchers proposed that dormant virus may become detectable more often around menopause.

Can the virus still clear at an older age?

Yes, in most people. The Demarco study found that about 80% of non-progressing infections were no longer detected within 3 years, with similar clearance across types, but persisting infections are the group that needs close follow-up.
After menopause, the zone where cervical cancer usually starts moves up into the cervical canal, making both Pap tests and colposcopy harder (see section 3).

How long should screening continue?

The US Preventive Services Task Force (2018)
recommends screening women aged 30–65 and allows stopping after 65 only for women with adequate prior negative screening who are not at high risk. A woman who tests HPV positive at 55 therefore needs follow-up until results return to negative by guideline criteria before stopping is considered.

3. Next steps under the ASCCP 2019 guideline

Short answer: the HPV result must be read together with the Pap result. With a normal Pap, repeat testing in 1 year is usual. If still positive at 1 year, or if the Pap is abnormal from the start, colposcopy follows.

The guideline of the American Society for Colposcopy and Cervical Pathology
(ASCCP 2019, Perkins 2020)
uses risk to decide, recommending colposcopy when the immediate risk of CIN3 or worse reaches 4%. A first positive result for a type other than 16/18 with a normal Pap is usually below this threshold. Your doctor may adjust the plan based on past results, such as a long gap since screening or previous abnormal tests.

Colposcopy after menopause

After menopause, the transformation zone often moves up into the cervical canal where it cannot be fully seen (a type 3 transformation zone), so doctors often add a scraping of cells from inside the canal (endocervical curettage).
A study of 137 postmenopausal women with persistent HPV
(Bruno 2025)
found that a normal scraping result meant about an 88.5% chance of truly having no high-grade lesion, making it useful to rule disease out. Thinner tissue after menopause can make cell results harder to read and may cause slightly more discomfort or spotting than in younger women. If you are worried about pain, tell your doctor before the procedure.

Pap result with HPV 51 and the next step, simplified (shown as cards on mobile).

4. What actually helps, and what does not

Short answer: no medicine or supplement clears HPV. What works is attending follow-up, treating a lesion if one is found, and stopping smoking.

• Attend every repeat test even if you feel well, and keep all your yearly reports together
• Stop smoking and avoid secondhand smoke: former smokers kept the virus longer (median 10.7 versus 8.5 months), and the longer the smoking history, the slower the clearance (Giuliano 2002)
• Sleep, exercise and stress management are good for overall health, but there is no evidence they clear HPV faster; do not blame yourself for feeling stressed
• Condoms partly reduce transmission; long-term partners usually already share the virus
• Ask your doctor clearly: what was this Pap result, when is the repeat test, and where would colposcopy be done if it stays positive

The HPV vaccine only protects against types not yet caught, and the US vaccine advisory committee recommendation extends to age 45 (Meites 2019), so it is not a treatment for an existing infection at 55.

Comparison of options; procedure and class names only (shown as cards on mobile).

Frequently asked questions (FAQ)

Common questions from women aged 50 and over who test positive for HPV 51

I tested positive for HPV 51 at age 55. How dangerous is it, and does it mean cancer?

It does not mean cancer. An HPV result only shows that the virus is present, not that cells are abnormal. HPV 51 is a high-risk type, but it sits in the lowest-risk tier of that group. In a study of 11,573 women aged 30 to 65, types 39, 51, 56, 59 and 68 carried under a 5% chance of CIN3 or worse over 7 years, compared with about 22% for HPV 16. What matters is reading the Pap result alongside it and returning for repeat testing on schedule.

How is HPV 51 different from HPV 16 and 18?

All are Group 1 carcinogens according to the International Agency for Research on Cancer, but their risk differs greatly. A study of 10,575 cervical cancers from 38 countries found HPV 16 or 18 in 71% of cancers, and 8 types, 16, 18, 31, 33, 35, 45, 52 and 58, together accounted for about 91%. HPV 51 is not among them. The ASCCP 2019 guideline therefore sends HPV 16 or 18 positive results straight to colposcopy, while HPV 51 with a normal Pap is retested in 1 year.

Why was it found only now at 55 when I have no new partner? Does it mean my partner was unfaithful?

It does not mean infidelity. HPV can stay dormant in cells for years and then become detectable again. A study of 700 women aged 35 to 60 found that 85% of newly detected infections occurred during periods of monogamy or no sexual activity, and only 13% could be explained by new partners. Another study found that at ages 50 to 60 a new partner explained only about 7.7% of detections. The test cannot tell when or from whom the infection came.

My Pap is normal but HPV 51 is positive. What happens next?

Under the ASCCP 2019 guideline, a first positive result with a normal Pap is usually followed by repeat HPV testing or co-testing in 1 year. If the repeat is negative, the risk drops considerably. If it is still positive at 1 year, colposcopy is recommended even if the Pap is normal. If the Pap is abnormal at ASC-US or LSIL or higher together with a positive HPV test, colposcopy is recommended right away. Your doctor may adjust the plan based on past results, such as previous abnormal tests or a long gap since the last screening.

How is colposcopy different after menopause?

After menopause, the zone where cervical cancer usually starts moves up into the cervical canal, so the colposcope may not see it fully. Doctors therefore often add a scraping of cells from inside the canal, called endocervical curettage. In a study of 137 postmenopausal women with persistent HPV, a normal result from this scraping meant about an 88.5% chance of truly having no high-grade lesion. Thinner tissue after menopause can make cell results harder to read and may cause slightly more discomfort or spotting than in younger women.

Can the body clear HPV 51 on its own after age 50?

Yes, in most people. A study following more than 14,000 infections found that about 80% of infections that did not progress were no longer detected within 3 years, with similar clearance rates across types. The same study found that age did not change risk much; what mattered more was how long the infection persisted. That is why repeat testing on schedule is needed to see whether the virus has cleared or is persisting.

At 55, should I get the HPV vaccine or take supplements to clear the virus?

Neither clears an existing infection. The HPV vaccine only protects against types you have not yet caught, and the US vaccine advisory committee recommendation extends to age 45, so it is not a treatment at 55. No supplement has been proven to clear HPV. What has evidence is stopping smoking and avoiding secondhand smoke, because smokers keep the virus longer, and attending every follow-up appointment.

Can I stop screening at 65 if I have had HPV 51?

Do not stop on your own. The US Preventive Services Task Force allows stopping after age 65 only for women with adequate prior negative screening who are not at high risk. Anyone who has had a positive HPV result needs follow-up until results return to negative by guideline criteria first, and women with a past high-grade lesion need longer follow-up. Ask your gynecologist when it is safe to stop.

Scientific mechanism in brief

Summarized by Asst. Prof. Dr. Norawit Raatpiboon:
HPV enters the basal cells of the cervical lining through tiny abrasions and stays within the lining without entering the bloodstream. When cellular immunity controls it, the viral load falls below detection, but viral DNA may persist at very low levels in basal stem cells (latency).
With age and menopause, hormonal and local immune changes may allow dormant virus to multiply again until it becomes detectable, consistent with data showing that most women of this age with newly detected HPV have no new partner.
Differences in risk between types come from how strongly the E6 and E7 proteins inhibit p53 and pRb, which is strongest in HPV 16 and 18 and weaker in types such as 51, so a less oncogenic type has to persist longer before a high-grade lesion develops.
After menopause, falling estrogen moves the transformation zone into the cervical canal, which is why endocervical sampling is used together with colposcopy.

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