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Other classes of periodic drug efficacies are considered and the effect of the phases of these functions on the dynamics of the model is also studied. The order of the fractional derivative plays an important role in the severity of the epidemics.<\/jats:p>","DOI":"10.1115\/1.4038643","type":"journal-article","created":{"date-parts":[[2017,12,6]],"date-time":"2017-12-06T14:42:13Z","timestamp":1512571333000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":12,"title":["Fractional Dynamics of an Infection Model With Time-Varying Drug Exposure"],"prefix":"10.1115","volume":"13","author":[{"given":"Carla M. A.","family":"Pinto","sequence":"first","affiliation":[{"name":"School of Engineering, Polytechnic of Porto, Rua Dr Ant\u00f3nio Bernardino de Almeida, 431, Porto 4249-015, Portugal e-mail:"}]},{"given":"Ana R. 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