Figure 7.

Reduction in the overall attack rate with two drugs versus a single drug for: (a) unlimited, and (c) limited (1.8%) stockpile of zanamivir. Reduction in the resistant attack rate with two drugs versus a single drug for: (b) unlimited, and (d) limited (1.8%) stockpile of zanamivir. The horizontal axis shows the time at which the switch to zanamivir as the primary drug occurs for different treatment levels displayed on the vertical axis. The solid (white) line corresponds to 50% treatment level (f_c) at which the overall attack rate is minimized for a single drug (oseltamivir).