Mathematical Modeling of Typhoid Fever Disease Incorporating Unprotected Humans in the Spread Dynamics
Julia Wanjiku Karunditu, George Kimathi, Shaibu Osman
Journal of Advances in Mathematics and Computer Science · pp. 1–11 · Published 16 May 2019
10.9734/jamcs/2019/v32i330144Abstract
A deterministic mathematical model of typhoid fever incorporating unprotected humans is formulated in this study and employed to study local and global stability of equilibrium points. The model incorporating Susceptible, unprotected, Infectious and Recovered humans which are analyzed mathematically and also result into a system of ordinary differential equations which are used for interpretations and comparison to the qualitative solutions in studying the spread dynamics of typhoid fever. Jacobian matrix was considered in the study of local stability of disease free equilibrium point and Castillo-Chavez approach used to determine global stability of disease free equilibrium point. Lyapunov function was used to study global stability of endemic equilibrium point. Both equilibrium points (DFE and EE) were found to be local and globally asymptotically stable. This means that the disease will be dependent on numbers of unprotected humans and other factors who contributes positively to the transmission dynamics.
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