Department of Mathematics Faculty of Science King Abdulaziz University P.O.Box 80203 Jeddah 21589 Saudi Arabia;
Department of Mathematics Faculty of Science King Abdulaziz University P.O.Box 80203 Jeddah 21589 Saudi ArabiaDepartment of Mathematics Faculty of Science University of Jeddah P.O.Box 80327 Jeddah 21589 Saudi Arabia;
Viral and cellular infections; global stability; adaptive immune response; Lyapunov function; multi-staged infected cells.;