Diseases such as HIV infection and hepatitis B, can be spread through body fluids, such as saliva, blood, vomit, and semen.
Protect yourself:
• Use latex condoms correctly.
• Do not inject drugs.
• Limit alcohol consumption. People take more risks when intoxicated.
• Do not share needles or any devices that can break the skin. That includes needles for tattoos, piercings, and acupuncture.
• If you receive medical or dental care, make sure the equipment is disinfected or sanitized.
From cdc.gov
