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The study suggests that condom use is highly effective among adolescents, when we have more of them quitting than becoming substance abusers. Measures such as educational campaigns can be put in place to try and reduce adolescents from becoming substance abusers. Further, we applied optimal control theory to the proposed model. The controls represent condom use and educational campaigns. The objective is based on maximising the susceptible nonsubstance abusing adolescents, while minimising the susceptible substance abusing adolescents, the infectious nonsubstance abusing adolescents, and the infectious substance abusing adolescents. We used Pontrygin\u2019s maximum principle to characterise the optimal levels of the two controls. The resulting optimality system is solved numerically. Overall, the application of the optimal control theory suggests that more effort should be devoted to condom use as compared to educational campaigns.<\/jats:p>","DOI":"10.1155\/2014\/104819","type":"journal-article","created":{"date-parts":[[2014,11,13]],"date-time":"2014-11-13T21:00:43Z","timestamp":1415912443000},"page":"1-17","source":"Crossref","is-referenced-by-count":7,"title":["HSV-2 and Substance Abuse amongst Adolescents: Insights through Mathematical Modelling"],"prefix":"10.1155","volume":"2014","author":[{"given":"A.","family":"Mhlanga","sequence":"first","affiliation":[{"name":"Department of Mathematics, University of Zimbabwe, P.O. Box MP 167 Mount Pleasant, Harare, Zimbabwe"}]},{"given":"C. P.","family":"Bhunu","sequence":"additional","affiliation":[{"name":"Department of Mathematics, University of Zimbabwe, P.O. 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