“…Mathematical models have become important tools in studying the behaviour of infectious diseases [14,15,16,17,18,19,20,21,22,23]. Mathematical models have also been developed to understand the dynamics of Chlamydia trachomatis, gonorrhea or their co-infections [24,25,26,27,28,29,30]. For instance, Gkana and Zachilas [24] developed a deterministic epidemic model for the spread of gonorrhea.…”