lambda1= 1;    % [cells/(mm^3 day)] Production source rate of CD4+ T-cells
d      = 0.1;  % Death rate of CD4+ T-cells
alpha1  = 1;   % Infection rate 
a      = 0.2;
p1     = 1; 
p2     = 1;
c1     = 0.03;
c2     = 0.06;
b1     = 0.1;
b2     = 0.01;
q      = 0.5;
eta    = 0.9799;
h      = .1; 