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Sexually transmitted infections (STIs) are more common than you think.

A sexually transmitted infection (STI), also known as a sexually transmitted disease (STD), is a virus, bacteria, fungus, or parasite people can get through sexual contact. More than 300,000 cases of chlamydia, gonorrhea, and syphilis were reported in 2021 in California and those are only three of many STIs. Here you'll find resources and information about the most common STIs and other infections that can be spread through sexual contact.

Chlamydia

Chlamydia

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Syphilis

Congenital Syphilis

Gonorrhea

Gonorrhea



Genital herpes

Genital Herpes


Hepatitis A

Hepatitis A

Hepatitis B

Hepatitis B



HIV

Human Immunodeficiency Virus (HIV)


HPV

Human Papillomavirus (HPV)ā€‹

Mpox

Mpox (formerly Monkeypox)


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Syphilis

Syphilis


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Learn more about otherā€‹ā€‹ STIs and related conditions

STIs are preventable!

Discover prevention strategies that can lower your risk of getting an STI.

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