The hepatitis B virus is transmitted mainly through unprotected sexual intercourse via sexual secretions and blood. This virus is highly contagious (100 times more than HIV). To protect against it, vaccination, which is effective for life, is compulsory for infants born after January 1, 2018. We recommend that you vaccinate your child before the age of 16. If you are aged 16 or over, you can still benefit from vaccination, if you are considered to be at risk. Don't hesitate to talk to your doctor. Condoms are also a means of preventing the virus and protecting against other STIs.

For further information, we recommend that you consult :

- Santé Publique France's "Question Sexualité" website
- The Santé Publique France website, and its thematic dossier on all STDs / STIs
- The "Sexualités entre hommes et prévention" information site
- Regional COREVIH websites
- The French Ministry of Solidarity and Health website, and the article "Informer sur le VIH/Sida et les autres infections sexuellement transmissibles (IST)".
- The section dedicated to STDs / STIs on the Assurance Maladie "Ameli" website

And more specifically for AIDS, you can consult the Sida Info Service website.