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 Resources​

Congenital Syphilis

Syphilis Resources​

Gonorrhea

Gonorrhea Resources

Genital Herpes

Herpes Resources

Hepatitis A

Hepatitis A Resources​

Hepatitis B

Hepatitis B Resources

Human Immunodeficiency Virus (HIV)

HIV Resources​

Human Papillomavirus (HPV)​

HPV Resources

Mpox (formerly Monkeypox)

Mpox Resources​

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Syphilis

Syphilis Resources

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Learn more about other​​ STIs and related conditions

• Bacterial Vaginosis (BV)
  

• Hepatitis C​

• Lymphogranuloma Venereum (LGV)
  

• Mycoplasma gen​italium (Mgen)
  

• Pelvic Inflammatory Disease (PID)
  

• Pubic lice
  

• Shigellosis
  

• Trichomoniasis

• Ureaplasma
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