Genital warts spread primarily through skin-to-skin sexual contact with someone who has human papillomavirus (HPV), even when no warts are visible. The virus passes through direct contact between genital, anal, or oral skin and mucous membranes during vaginal, anal, or oral sex. About 90% of genital warts cases are caused by two specific strains of HPV: types 6 and 11.
Skin-to-Skin Contact Is the Main Route
HPV doesn’t require the exchange of bodily fluids to spread. The virus lives in skin cells and passes from one person to another when infected skin touches a partner’s skin or mucous membranes. Vaginal and anal intercourse are the most common ways this happens, but any genital-to-genital contact can transmit the virus, even without penetration. Ejaculation is not necessary for transmission.
This is what makes HPV so widespread. It’s the most common sexually transmitted infection in the United States, with roughly 14 million new infections each year across all HPV types. An estimated 3.7 million people between ages 15 and 59 carry the two strains responsible for genital warts at any given time, and about 300,000 new infections with those strains occur annually.
You Can Spread It Without Any Symptoms
Most people with genital HPV never develop visible warts. The virus often produces no symptoms at all, which means many people spread it without knowing they’re infected. You remain contagious for as long as the virus is in your body, whether or not warts have appeared, and even after warts have been treated and disappeared. This “silent” transmission is a major reason HPV spreads so easily. Most sexually active people who aren’t vaccinated will get some form of HPV during their lifetime.
The Long, Unpredictable Incubation Period
When warts do develop, they typically show up about two to three months after infection, but the range is enormous: anywhere from one month to nearly two years. This long window makes it nearly impossible to pinpoint exactly when or from whom you caught the virus. Someone could be infected during one relationship and not see warts until well into the next, which often creates confusion and unnecessary blame. The delay also means the virus can be unknowingly passed to new partners long before any signs appear.
Oral Sex and Kissing
HPV can spread to the mouth and throat through oral sex and, less commonly, deep kissing. About 7% of people aged 18 to 60 in the U.S. develop oral HPV. The biggest risk factor is performing oral sex on someone who carries the virus. Transmission is more likely if there’s an open sore or small cut in the mouth that allows the virus entry. Having an existing genital HPV infection also increases the risk of developing oral HPV.
Mother-to-Child Transmission
HPV can pass from mother to baby, though it’s uncommon. Vertical transmission occurs in roughly 7% of cases, and it can happen during conception, while the baby is still in the womb, or during childbirth. The virus can affect different areas of the newborn, including the mouth, throat, eyes, and genitals. In rare cases, babies born to mothers with active genital warts develop growths in the throat, a condition that can require ongoing treatment.
Can You Get It From Objects or Surfaces?
HPV is unusually hardy for a virus. It resists heat and drying and can survive on inanimate objects like clothing, towels, and medical equipment that have contacted infected skin. Prolonged exposure to contaminated items could theoretically allow transmission. However, the exact survival time on surfaces isn’t known, and this route of transmission is considered far less significant than direct sexual contact. Sharing towels or underwear is not a major risk factor, but it’s not impossible either.
How Much Do Condoms Help?
Condoms reduce the risk of HPV transmission, but they don’t eliminate it. Because HPV lives in skin cells across the entire genital area, condoms only protect the skin they cover. That said, the protection is still meaningful. Women whose partners used condoms consistently for all instances of vaginal intercourse were 70% less likely to acquire a new HPV infection compared to women whose partners rarely used them. Even using condoms more than half the time cut the risk by about 50%.
The gap in protection exists because HPV can infect skin on the scrotum, vulva, inner thighs, and other areas a condom doesn’t reach. Still, consistent condom use significantly lowers your chances and reduces the amount of virus exchanged during contact.
Vaccination Is the Strongest Prevention
The current HPV vaccine covers nine strains of the virus, including types 6 and 11, which cause nearly all genital warts cases. The vaccine generates a strong antibody response against these strains and is most effective when given before any exposure to the virus, which is why it’s recommended starting at age 11 or 12. Adults up to age 26 are routinely recommended for vaccination, and some adults between 27 and 45 may benefit from it after discussing their risk with a provider.
Since the vaccine was introduced, genital wart diagnoses have dropped sharply in vaccinated populations. In countries with high vaccination rates, wart cases have declined not only among vaccinated individuals but also among unvaccinated people, thanks to reduced overall circulation of the virus.