This site contains HIV prevention messages that
might not be appropriate for all audiences.
Since HIV infection is spread primarily through
sexual practices or by sharing needles,
prevention messages and programs may address
these topics. If you are not seeking such
information or may be offended by such
materials, please exit this website.
*The CDC provides this information as a public service only. Providing synopses of key scientific articles and lay media reports on HIV/AIDS, other sexually transmitted diseases, and tuberculosis does not constitute CDC endorsement.
August 21, 2009
Last Reviewed: August 21 2009
Divisions of HIV/AIDS Prevention
National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention