Is Schistosomiasis Sexually Transmitted?

No, schistosomiasis is not a sexually transmitted infection (STI), and it is entirely impossible to pass it to your partner through sexual contact, kissing, or sharing a bed. Even if you have genital schistosomiasis, the condition is not contagious from person to person through physical, casual, or sexual contact ^[1][2][3].

If you are experiencing symptoms like pelvic pain, unusual discharge, or bleeding, it is completely understandable to feel anxious about passing the infection to your partner. Genital schistosomiasis heavily mimics the symptoms of common STIs, which inevitably leads to fear and stigma. However, the parasite that causes this condition has a very specific and complex life cycle that makes direct human-to-human transmission impossible ^[1][2].

Why You Cannot Pass It to a Partner

To infect a human, the parasite (Schistosoma) absolutely requires a specific intermediate host: a freshwater snail ^[1][3].

Here is how the parasite’s life cycle works, which explains why you cannot infect your partner directly:

• The freshwater requirement: The parasite’s eggs must first leave an infected person’s body through urine or feces and reach a body of fresh water (like a lake, river, or stream) to hatch ^[1][2].
• The snail host: Once hatched, the parasite must find and infect a specific type of freshwater snail, where it lives and multiplies ^[2][3].
• The return to water: The snail eventually releases the mature, infectious form of the parasite back into the water ^[1][2].
• Human infection: A person can only become infected when they swim, wade, or bathe in this contaminated fresh water, allowing the parasite to directly penetrate their skin ^[4][5].

Because the parasite must spend time developing inside a snail before it can infect a human, there is no risk of transmitting it through bodily fluids or sexual intercourse ^[1][2]. For men with Male Genital Schistosomiasis, parasite eggs or blood can sometimes appear in semen (hematospermia) ^[6]. This can be extremely alarming, but even if eggs are present in semen, they cannot infect a partner because they have not gone through the necessary freshwater snail stage ^[1][2].

Having Sex with Active Genital Schistosomiasis

While you cannot pass the infection to your partner, it is important to consider your own physical safety and comfort.

Genital schistosomiasis causes inflammation, open sores, and sometimes bleeding in the reproductive tract, which can make intercourse physically painful. You and your doctor can discuss when it is safe and comfortable for you to resume sexual activity as your lesions heal and your treatment takes effect.

Additionally, while you cannot give schistosomiasis to your partner, having active genital schistosomiasis makes you more vulnerable to catching other infections. The sores and inflammation compromise the protective mucosal lining of your genitals, which significantly increases your risk of acquiring an actual STI, such as HIV, if you are exposed to one ^[7][8][9]. Using barrier protection, like condoms, can help protect you from acquiring other infections while your body heals.

What About Your Partner’s Health?

While you cannot give schistosomiasis to your partner, it is possible for your partner to also have the disease if you both traveled to or lived in the same areas. Since the infection is contracted by coming into contact with contaminated water, couples or families who swim, bathe, or work in the same lakes or rivers may all become infected independently from the same water source ^[4][5].

If your partner is experiencing similar symptoms, they should be evaluated by a healthcare professional—not because they caught it from you, but because they may have shared the same environmental exposure ^[4].