Figure 5. Simulations of Model (3) on sequential treatment with antibiotics A and B.

(a) Treatment with antibiotic A starts at the 3^rd day after the infection and lasts for 10 days, right after that antibiotic B is administrated for 10 days, and at the 40^th day both antibiotics A and B are used for 10 days. (b) Same therapies except that the first treatment starts at the 1^st day after the infection.