“…In Malik et al (2013) one is faced with a study regarding three types of plurivalent vaccines against the human papillomavirus (HPV), which considers distinct dynamics for women and men. Outside pandemic models, optimal control strategies can be used to study drug administration in HIV treatment (PASTORE et al, 2018;ARRUDA et al, 2015). In addition, a variety of optimal control strategies in biological mathematical models can be found in the literature, see for example (FATMAWATI;TASMAN, 2015;HELAL et al, 2015;NANNYONGA et al, 2015;TAI et al, 2015).…”