Which common STI is associated with an increase in HIV transmission risk?

The common sexually transmitted infection that is associated with an increase in HIV transmission risk is syphilis. Syphilis can cause sores and breaks in the skin or mucous membranes, which can serve as entry points for the HIV virus. When a person is co-infected with syphilis and HIV, the presence of syphilis sores increases the likelihood of HIV infection during sexual contact. Moreover, syphilis is often linked with high-risk sexual behavior, which may further contribute to the spread of HIV.

While other STIs like chlamydia, herpes simplex virus, and trichomoniasis are also significant public health concerns and can have their own complications, the direct correlation between syphilis and the increased transmission of HIV is particularly notable in studies examining co-infection rates and community health impacts.