Syphilis is not contagious through ordinary, everyday touch. You will not get syphilis from a handshake, a hug, sharing a towel, or sitting on a toilet seat. The bacteria that causes syphilis can only spread through direct contact with an active syphilis sore or rash, which almost always happens during vaginal, anal, or oral sex. In rare cases, it can spread through kissing or touching a sore on the lips or mouth.
What Kind of Touch Actually Spreads Syphilis
Syphilis spreads when your skin or mucous membranes come into direct contact with an infectious sore called a chancre (pronounced “SHANG-kur”) or with the rash that appears in the second stage of infection. The sore is the exact spot where the bacteria entered someone’s body, and it’s teeming with the organism that causes the disease. These sores most commonly appear on or around the genitals, anus, rectum, lips, or inside the mouth.
Most people develop only one chancre, though some get more than one. The sore is often painless, which means people may not realize they have it or that they’re contagious. This is part of what makes syphilis tricky: someone can pass it on without knowing they’re infected.
Sexual contact is by far the primary route. Condoms reduce the risk by preventing contact with a sore, but sores sometimes appear in areas a condom doesn’t cover, like the scrotum, inner thighs, or mouth. Contact with those exposed sores can still transmit the infection.
Can You Get Syphilis From Kissing
It’s uncommon, but possible. If someone has an active syphilis sore or rash in or around their mouth, kissing them can transfer the bacteria, especially deep kissing where mucous membranes are involved. The Cleveland Clinic notes that touching intact skin carries a low risk overall, but if a syphilis rash is broken or leaking fluid, the risk goes up because the bacteria can pass through bodily fluids. On normal, unbroken skin, the bacteria is not readily present and poses very little threat.
Why Casual Contact Is Safe
The syphilis bacterium cannot survive outside the body’s mucous membranes. It dies quickly when exposed to air or dry surfaces. This means you cannot catch syphilis from toilet seats, doorknobs, shared utensils, swimming pools, or clothing. A casual handshake, even prolonged skin-to-skin contact like holding hands, poses no meaningful risk as long as there’s no direct contact with an active sore.
This distinguishes syphilis from infections like cold sores or skin staph, which can linger on surfaces or spread through brief contact. Syphilis requires a very specific type of exposure: the bacteria from an active lesion entering your body through a mucous membrane or a break in the skin, like a cut or scratch.
When Syphilis Is Most Contagious
Syphilis is contagious during its primary and secondary stages. The primary stage is defined by the appearance of the chancre, which shows up at the site where the bacteria entered the body. Because these sores are painless, they sometimes go unnoticed, particularly when they’re inside the rectum, vagina, or mouth.
The secondary stage brings a skin rash that can appear on the palms of the hands, the soles of the feet, or other parts of the body, along with mucous patches in the mouth or genital area. These lesions also carry the bacteria. If someone touches a secondary-stage rash that is broken or weeping fluid, there is some risk of transmission, though this is far less common than sexual transmission.
Once syphilis moves into its latent (hidden) stage, there are no visible sores or rashes, and the person is generally not contagious through contact. However, the infection is still present in the body and can cause serious damage over time if untreated. A pregnant person with syphilis at any stage can pass it to their baby, which is why congenital syphilis remains a serious public health concern, with nearly 4,000 cases reported in the U.S. in 2024.
How Syphilis Is Treated and Detected
Syphilis is diagnosed with a blood test and is curable with antibiotics, especially when caught early. Treatment in the primary or secondary stage is straightforward and highly effective. The longer the infection goes untreated, the more complicated treatment and potential damage become.
If you’re concerned about exposure, the key question is whether you had direct contact with an active sore or rash, particularly during sexual activity or intimate kissing. A routine handshake, hug, or shared drink does not put you at risk. Anyone who is sexually active and has new or multiple partners can ask their healthcare provider about syphilis screening, which is a simple blood draw. In the U.S., about 190,000 total syphilis cases were reported in 2024, so while rates have started declining in recent years, the infection remains common enough to warrant awareness.