- Chlamydia and Gonorrhea: These bacterial infections can lead to serious reproductive health issues if left untreated. - Human Immunodeficiency Virus (HIV): Early detection can improve management and reduce the risk of transmission. - Syphilis: Early stages are treatable, but late stages can cause severe complications. - Human Papillomavirus (HPV): Some strains can lead to cervical cancer; screening is typically done via Pap smear and HPV testing. - Hepatitis B and C: These infections can cause chronic liver disease and are particularly important to screen for in high-risk populations. - Trichomoniasis: A parasitic infection that can cause discomfort and increase the risk of other STIs.