What are sexually transmitted infections?

Sexually transmitted infections (STIs) are also called sexually transmitted diseases, or STDs. STIs are usually spread by having vaginal, oral, or anal sex. More than 9 million women in the United States are diagnosed with an STI each year. read more

Sexually transmitted diseases (STDs) are passed from one person to another through intimate physical contact – such as heavy petting – and from sexual activity including vaginal, oral, and anal sex. STDs are very common. In fact, CDC estimates 20 million new infections occur every year in the United States. read more

Sexually transmitted infections (STIs) are also called sexually transmitted diseases, or STDs. STIs are usually spread by having vaginal, oral, or anal sex. More than 9 million women in the United States are diagnosed with an STI each year. 1 Women often have more serious health problems from STIs than men, including infertility. read more

Sexually transmitted diseases (STDs) are infections you can get from having sex with someone infected. Learn about prevention, testing, and treatment. read more