“contracting an HPV infection is a common side effect of the HPV vaccine”

• No credible evidence supports the claim. The only kernels that get stretched into it: (a) some people vaccinated after sexual debut later test positive for HPV because they were already infected with a vaccine or non-vaccine type before immunization — a timing coincidence, not vaccine-caused infection; (b) genital warts or abnormal Pap results occasionally appear after vaccination, again from pre-existing or non-covered HPV types, since the vaccine is prophylactic and does not clear established infection.
• Anti-vaccine literature has cited findings of residual recombinant HPV L1 DNA fragments in Gardasil vials (reported by SANE Vax in 2011 and echoed in some later PCR-based claims). This is sometimes offered as 'proof' the vaccine transmits HPV, but the fragments are non-infectious plasmid remnants of the manufacturing process, contain no complete viral genome, and cannot replicate or establish infection — the FDA reviewed and rejected the safety implication.

• HPV vaccines (Gardasil, Gardasil 9, Cervarix) are non-infectious, recombinant virus-like particle (VLP) vaccines made of the L1 capsid protein only. They contain no viral DNA and therefore cannot replicate or cause HPV infection — this is stated explicitly in the FDA-approved prescribing information and by CDC, WHO and the National Cancer Institute.
• The actual common side effects listed on the product labels and by CDC are local and systemic reactogenicity: injection-site pain, redness and swelling, headache, fever, nausea, dizziness/fainting (syncope) and fatigue. 'HPV infection' does not appear as an adverse reaction in any package insert or pharmacovigilance summary.
• Randomized controlled trials and pooled analyses (e.g., the Cochrane review of 26 trials, ~73,000 participants) found HPV rates and precancer rates were substantially LOWER in vaccinated groups, the opposite of what would occur if the vaccine caused infection.
• Post-licensure surveillance across hundreds of millions of doses (VAERS/VSD in the US, WHO's Global Advisory Committee on Vaccine Safety reviews, and large Nordic and Danish registry cohorts) has identified no signal for vaccine-induced HPV infection. GACVS has repeatedly reaffirmed the vaccines' safety profile.
• Ecological data confirm the reverse effect: in countries with high coverage, prevalence of vaccine-targeted HPV types fell 80–90% in young women, and cervical cancer incidence in women vaccinated before age 17 has dropped close to zero in Swedish and UK cohort studies.
• Immunological principle: infection requires an intact viral genome to enter cells and replicate. A capsid-protein shell with no genetic material is biologically incapable of producing an infection, the same reason a hepatitis B surface-antigen vaccine cannot cause hepatitis B.

97/100 — the lab’s own confidence in the score above, not a second reading of the claim.

U.S. Food and Drug Administrationgov · 98 · National Cancer Institute (NIH)gov · 97 · U.S. Centers for Disease Control and Preventiongov · 96 · WHO Global Advisory Committee on Vaccine Safetygov · 95 · Cochrane Database of Systematic Reviews (Arbyn et al., 2018)journal · 94 · New England Journal of Medicine (Lei et al., 2020, HPV vaccination and cervical cancer risk)journal · 95 · UK National Health Servicegov · 92 · Mayo Clinicedu · 90

• No good evidence supports the claim as written. The closest kernel is that an HPV diagnosis can occur after vaccination because HPV vaccines prevent new infections best when given before exposure; they do not treat existing HPV infections and do not protect against every HPV type.
• A temporal association is possible: someone vaccinated after prior exposure, before full immune protection, or later exposed to a non-vaccine HPV type could test positive for HPV. That is not evidence that HPV infection is a vaccine side effect.

• CDC says HPV vaccines are made from one protein from the virus and are not infectious, meaning they cannot cause HPV infection or cancer.
• The National Cancer Institute explains that HPV vaccines use virus-like particles that lack viral DNA, so they are noninfectious.
• The FDA-approved Gardasil 9 label describes the vaccine as recombinant virus-like particles and lists common adverse reactions such as injection-site pain, swelling, redness, and headache—not HPV infection.
• Large clinical and population studies show HPV vaccination reduces HPV infections and HPV-related disease rather than causing HPV infection.
• CDC guidance states HPV vaccination prevents new HPV infections but does not treat existing infections, which explains why HPV may be detected after vaccination without being caused by the vaccine.

96/100 — the lab’s own confidence in the score above, not a second reading of the claim.

CDCgov · 95 · National Cancer Institutegov · 95 · FDAgov · 96 · CDCgov · 95 · New England Journal of Medicinejournal · 94 · The Lancetjournal · 93

• There is no scientific or medical evidence supporting the claim that the HPV vaccine causes an HPV infection.
• Misconceptions sometimes arise when individuals who were already unknowingly infected with HPV prior to vaccination are later diagnosed, leading them to falsely attribute the pre-existing infection to the vaccine.

• HPV vaccines (such as Gardasil 9) are non-infectious. They are manufactured using recombinant technology to create Virus-Like Particles (VLPs).
• VLPs are empty protein shells that mimic the virus's outer coat to provoke a strong immune response, but they contain absolutely no viral DNA or RNA (neither live nor killed).
• Because the vaccine lacks any viral genetic material, it cannot reproduce inside the human body. Therefore, it is biologically impossible for the vaccine to cause an HPV infection.
• Decades of rigorous safety trials and post-market monitoring involving millions of administered doses have never found HPV infection to be a side effect of the vaccine.
• Major public health and medical organizations, including the CDC, FDA, WHO, and the National Cancer Institute, explicitly confirm that the HPV vaccine cannot cause HPV infections or cancer.

100/100 — the lab’s own confidence in the score above, not a second reading of the claim.

National Cancer Institutegov · 100 · Children's Hospital of Philadelphiaedu · 95 · Mayo Clinicother · 95

• HPV infection can occur after vaccination if a person was exposed before vaccination, if exposure involves an HPV type not covered by the vaccine, or because the vaccine does not provide complete protection; however, this represents vaccine limitations or coincidental infection, not a vaccine side effect. The available evidence does not support the claim that the vaccine causes HPV infection.

• The HPV vaccines are noninfectious and do not contain live virus or viral genetic material capable of causing infection. CDC states that the vaccine is made from one viral protein and cannot cause HPV infection or cancer. https://www.cdc.gov/hpv/media/pdfs/2024/07/vaccine-safety.pdf
• CDC lists common adverse effects as injection-site pain, redness or swelling, fever, headache, fatigue, nausea, and muscle or joint pain; HPV infection is not listed as a common adverse effect. https://www.cdc.gov/vaccine-safety/vaccines/hpv.html
• WHO reports that the most common adverse events are injection-site reactions and muscle pain, and says HPV vaccines are not live vaccines and cannot cause HPV infection or cancer. https://www.who.int/groups/global-advisory-committee-on-vaccine-safety/topics/human-papillomavirus-vaccines/safety-of-hpv
• The American Academy of Pediatrics' AAP FactCheck directly describes the claim that HPV vaccines cause HPV infection as false, explaining that the vaccines do not contain live or inactivated viruses. https://www.aap.com.au/factcheck/viral-clip-spreads-misinformation-on-australian-developed-hpv-vaccines/
• The American College of Obstetricians and Gynecologists states that the HPV vaccine does not contain live viruses and therefore cannot cause HPV infection. https://www.acog.org/womens-health/faqs/hpv-vaccination

99/100 — the lab’s own confidence in the score above, not a second reading of the claim.

U.S. Centers for Disease Control and Preventiongov · 99 · U.S. Centers for Disease Control and Preventiongov · 99 · World Health Organizationgov · 99 · AAP FactCheckfactcheck · 92 · American College of Obstetricians and Gynecologistsother · 94

• Anti-vaccination websites and social-media posts sometimes treat a later HPV diagnosis as proof the shot caused infection.
• Unverified VAERS reports list HPV after vaccination; those reports record temporal association only and do not demonstrate that the vaccine produced the infection.

• Licensed HPV vaccines (Gardasil, Gardasil 9, Cervarix) contain only recombinant L1 protein assembled into virus-like particles; they have no viral DNA or live virus and therefore cannot infect anyone.
• CDC, FDA, WHO and the National Cancer Institute state explicitly that the vaccine cannot cause HPV infection.
• Randomized trials of tens of thousands of participants showed large reductions, not increases, in incident vaccine-type HPV infection and related disease.
• Post-licensure surveillance covering hundreds of millions of doses has found no signal that the vaccine transmits or causes HPV.
• HPV is acquired by most sexually active people; diagnoses after vaccination almost always reflect prior infection, non-vaccine HPV types, or ordinary community acquisition, not a vaccine side effect.
• Documented common side effects are injection-site pain, swelling, headache and syncope, not HPV infection.

93/100 — the lab’s own confidence in the score above, not a second reading of the claim.

National Cancer Institutegov · 97 · World Health Organizationgov · 95 · U.S. Food and Drug Administrationgov · 96