To examine the effects of lower drug efficacy, we look at the scatter plot of total attack rate against aggregate cost for both sets of simulations-base and reduced drug efficacy (figure 9). From the plot, there is a general increase in both total attack rates and costs with decreased drug effectiveness. Again, the results can be clustered by the intervention policies. However, it is interesting to note that, similar to varying the diagnosis compliance rate, points from policies P4a and P4c collectively experience a larger amount shift along both axes. Conversely, for a more effective antiviral drug, the impact on reducing both attack rates and costs through the implementation of policies involving full contact tracing and prophylaxis to the contacts will most probably be more significant.