Mpox (monkeypox)
Mpox – also known as monkeypox until late 2022 – is an infectious virus that can affect humans and some animals (but not monkeys) and is closely related to smallpox. There was a worldwide outbreak in 2022, during which the disease was primarily transmitted through sexual contact. The mpox virus has now become established in Europe (including Switzerland) as a sexually transmitted infection among men who have sex with men. In August 2024 a new variant of the mpox virus which is found predominantly in Central Africa was also seen in Europe (in Sweden) for the first time. It was identified in Switzerland for the first time in 2025.
- Transmission routes
- Protection
- Symptoms
- Testing
- Treatment
- If you are diagnosed with mpox: let your sexual partners know
- Information for those who are pregnant
Transmission routes
Mpox can be spread between people through contact with infectious blisters, pustules or scabs on the skin, in the mouth, or on the genitals. This may be through touching, close contact or sex. The fluid in blisters is particularly infectious, as are the scabs.
Protection
There is an mpox vaccine. The FOPH recommends that people at increased risk of infection get vaccinated. This includes men and trans people who have sex with men and who (frequently) have multiple partners, and anyone who has sexual or other close physical contact with someone who has mpox. The costs of vaccination are covered by the health insurance for people at increased risk of infection.
Symptoms
Typical symptoms are a rash that starts as flat spots, before turning into pus-filled blisters and then scabbing over. People typically also have a high temperature and swollen lymph nodes. The severity of symptoms varies from one person to another. In some cases, people may only have very mild, isolated symptoms. The symptoms include the following:
- Skin changes (lesions) with painful pustules and blisters,
- Mainly on the genitals, in the anal area, and in the mouth
- Flu-like symptoms (high temperature, chills, headache, muscle and back ache, sore throat etc.)
In most cases, the disease heals on its own after a few weeks. No long-term effects of infection are currently known. People with weakened immune systems and infants, children and pregnant women appear to have an increased risk of severe disease.
Testing
If you have symptoms and suspect you may have mpox, it’s important you consult a medical professional as soon as possible. They will decide whether you need a test.
Treatment
In most cases, no special treatment is needed. If the symptoms are mild to moderate, they can be treated with painkillers and ointments. If the symptoms are severe, antiviral therapy may be given. People with mpox should refrain from sexual and other close physical contact until the skin lesions have healed (the scabs have fallen off).
If you are diagnosed with mpox: let your sexual partners know
Talking about sexually transmitted infections (STIs) isn’t always easy. But it’s important that your sexual partners know about your infection so they can seek information and medical advice. Here you’ll find information on what to do if you are diagnosed with mpox.
Information for those who are pregnant
There is only limited information about the effects of an mpox infection on pregnant women. The World Health Organization WHO has reported that transmission of mpox can occur both via the placenta and via close contact during or after birth. The risk of mpox infection for the general population and for those who are pregnant in Switzerland is low.