| http://www.w3.org/ns/prov#value | - Recently, a model of this type including the possibility of disease relapse has been proposed in [5, 6] to study the transmission and spread of some infectious diseases such as herpes, and its global dynamics have been completely investigated in [5, 7].Heterogeneity in the host population can result from different contact modes such as those among children and adults for childhood diseases (e.g.,
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