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What causes STDs?

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Sexually transmitted diseases (STDs) include just about every kind of infection. Bacterial STDs include chlamydia, gonorrhea, and syphilis. Viral STDs include HIV, genital herpes, genital warts (HPV), and hepatitis B. Trichomoniasis is caused by a parasite.

The germs that cause STDs hide in semen, blood, vaginal secretions, and sometimes saliva.

SOURCES: American Academy of Family Physicians. CDC National Center for HIV, STD, and TB Prevention. U.S. Department of Health and Human Services. Hepatitis B Foundation.



Reviewed by Traci C. Johnson on January 30, 2019

SOURCES: American Academy of Family Physicians. CDC National Center for HIV, STD, and TB Prevention. U.S. Department of Health and Human Services. Hepatitis B Foundation.



Reviewed by Traci C. Johnson on January 30, 2019

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Where do the germs that cause sexually transmitted diseases (STDs) come from?

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