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This narrative review examines the biological interactions between HIV, herpes simplex virus type 2 (HSV-2), syphilis, and human papillomavirus (HPV), with particular emphasis on mucosal disruption, immune activation, and implications for integrated prevention and care. Evidence indicates that HSV-2-associated genital ulceration and recruitment of HIV-susceptible immune cells may increase HIV acquisition risk, while syphilis-associated systemic immune activation can transiently affect HIV viral load and CD4 cell counts. Persistent HPV infection may also promote inflammatory mucosal environments relevant to HIV susceptibility and HPV-associated disease in people living with HIV. However, evidence from intervention studies demonstrates that biological associations do not necessarily translate into effective HIV prevention through treatment of individual co-infections. Collectively, the evidence supports greater integration of STI screening, treatment, HPV vaccination, cancer screening, and HIV prevention and care, while highlighting important gaps in evidence regarding the clinical effectiveness of syndemic-informed integrated interventions.<\/jats:p>","DOI":"10.1177\/00368504261492492","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T12:40:10Z","timestamp":1790167210000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Sexually transmitted infection syndemic interactions: Biological amplification between HIV, HSV-2, syphilis, and HPV and implications for co-treatment strategies"],"prefix":"10.1177","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-6206-1257","authenticated-orcid":false,"given":"Esoh","family":"Rene Tanwieh","sequence":"first","affiliation":[{"name":"University of Bamenda"},{"name":"Health Organisation Welfare (HOW)"},{"name":"Punjabi University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kiranjot","family":"Kaur","sequence":"additional","affiliation":[{"name":"Punjabi University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uthman Okikiola","family":"Adebayo","sequence":"additional","affiliation":[{"name":"Federal University of Health Sciences Teaching Hospital"},{"name":"Daffodil International University"},{"name":"Global Health Focus Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2000-7451","authenticated-orcid":false,"given":"Rajshreejeet Jayant","family":"Bhensdadiya","sequence":"additional","affiliation":[{"name":"Government Medical College"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Misonge Kapnang","family":"Ivan","sequence":"additional","affiliation":[{"name":"Health Organisation Welfare (HOW)"},{"name":"University of Dschang"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shey Fortune","family":"Ndzi","sequence":"additional","affiliation":[{"name":"Florence Nightingale Higher Institute of Health and Biomedical Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Ricky","sequence":"additional","affiliation":[{"name":"Jomo Kenyatta University of Agriculture and Technology"},{"name":"Kocaeli University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohit","family":"Paul","sequence":"additional","affiliation":[{"name":"Lyallpur Khalsa College"},{"name":"Technical Campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Solomon","family":"Gyampoh","sequence":"additional","affiliation":[{"name":"Chitkara University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ishmael","family":"Gumbo","sequence":"additional","affiliation":[{"name":"University of Zambia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amit","family":"Pal","sequence":"additional","affiliation":[{"name":"AIIMS Kalyani"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"e_1_3_6_2_2","doi-asserted-by":"publisher","DOI":"10.2471\/BLT.18.228486"},{"key":"e_1_3_6_3_2","volume-title":"Introduction to syndemics: a systems approach to public and community health","author":"Singer M","year":"2009","unstructured":"Singer M. 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