Figure 2: (a) The evolution of the worst case scenario, that is, when no control is applied, is shown in bullets ( ) for susceptibles and infected classes in each patch. Using the parameter values found by the algorithm provides the scenario shown in (▲). (b) The total amount of infected individuals in both populations. Again, the worst case scenario is in ( ) and the minimized results in (▲). The appearance of a second bump is due to the delay of introducing infective individuals in the initially disease-free population. (c) These are the strategy levels that minimize the total cost.