{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T11:35:09Z","timestamp":1786707309795,"version":"build-2736575974"},"reference-count":20,"publisher":"Danish Medical Association","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Dan Med J"],"abstract":"<jats:p>INTRODUCTION. Human papillomavirus (HPV) is the most common sexually transmitted infection, with an 80% lifetime risk of infection. This study investigated adolescents\u2019 knowledge of sexually transmitted infections and examined whether this knowledge was associated with HPV vaccination status or influenced decisions regarding condom use.\n\nMETHODS. This study has a cross-sectional design and was based on data from an annual questionnaire distributed to all ninth-graders in T\u00f8nder, Denmark, between 2020 and 2024.\n\nRESULTS. Among 1,254 pupils in ninth grade, 866 (69%) answered the questionnaire. 20% had their sexual debut at a median age of 14 years, and most within the year leading up to the questionnaire. Within the overall group, knowledge of three or more STIs was associated with HPV vaccination (p = 0.001). At their most recent sexual activity, 62% used condoms and\/or oral contraceptives. The girls reported greater reliance on contraceptives than boys across different circumstances, with rates of 70-80%compared with 50-55%, respectively. The HPV vaccination was associated with an increased use of condoms.\n\nCONCLUSIONS. HPV-vaccinated adolescents knew more about sexually transmitted diseases and more often used condoms.\n\nFUNDING. None.\n\nTRIAL REGISTRATION. Not relevant.<\/jats:p>","DOI":"10.61409\/a09250766","type":"journal-article","created":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T10:41:43Z","timestamp":1783075303000},"page":"1-7","source":"Crossref","is-referenced-by-count":0,"title":["Adolescence, sexually transmitted infections and human papillomavirus vaccination"],"prefix":"10.61409","author":[{"given":"Lise Dokkedahl","family":"Christensen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mette Hulb\u00e6k","family":"Andersen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle Dahl","family":"Koed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirstine","family":"Bekke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karsten","family":"Kaiser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bashayir Said Mussa","family":"Issa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Finn Friis","family":"Lauszus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"40208","published-online":{"date-parts":[[2016,6]]},"reference":[{"key":"ref0","unstructured":"Centers for Disease Control and Prevention. Sexually transmitted infections surveillance, 2024 (provisional). Centers for Disease Control and Prevention, 2025"},{"key":"ref1","doi-asserted-by":"publisher","unstructured":"zur Hausen H. Papillomaviruses in the causation of human cancers - a brief historical account. Virology. 2009;384(2):260-265. https:\/\/doi.org\/10.1016\/j.virol.2008.11.046","DOI":"10.1016\/j.virol.2008.11.046"},{"key":"ref2","doi-asserted-by":"publisher","unstructured":"Lei J, Ploner A, Elfstr\u00f6m KM, et al. HPV vaccination and the risk of invasive cervical cancer. N Engl J Med. 2020;383(14):1340-1348. https:\/\/doi.org\/10.1056\/NEJMoa1917338","DOI":"10.1056\/NEJMoa1917338"},{"key":"ref3","unstructured":"Danish Health Authority. Information about the Danish cervical cancer screening programme. www.sst.dk\/media\/fwejqrgl\/uk-pjece-livmoderhalskraeft.pdf (24th Mar 2025)"},{"key":"ref4","unstructured":"Hammer A, Petersen LK, Rolving N, et al. Possible side effects from HPV vaccination in Denmark. Ugeskr L\u00e6ger. 2016;178(26):V03160205"},{"key":"ref5","doi-asserted-by":"publisher","unstructured":"Blomberg M, Dehlendorff C, Munk C, et al. Strongly decreased risk of genital warts after vaccination against human papillomavirus: nationwide follow-up of vaccinated and unvaccinated girls in Denmark. Clin Infect Dis. 2013;57(7):929-934. https:\/\/doi.org\/10.1093\/cid\/cit436","DOI":"10.1093\/cid\/cit436"},{"key":"ref6","doi-asserted-by":"publisher","unstructured":"Baldur-Felskov B, Dehlendorff C, Munk C, et al. Early impact of human papillomavirus vaccination on cervical neoplasia - nationwide follow-up of young Danish women. J Natl Cancer Inst. 2014;106(3):djt460. https:\/\/doi.org\/10.1093\/jnci\/djt460","DOI":"10.1093\/jnci\/djt460"},{"key":"ref7","doi-asserted-by":"publisher","unstructured":"Beavis A, Krakow M, Levinson K, et al. Reasons for lack of HPV vaccine initiation in NIS-Teen over time: shifting the focus from gender and sexuality to necessity and safety. 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