In our model, each index case is handled by a decision analytical model. The overview of the decision flowchart is described in figure 2. For simplicity, it is also assumed that each decision is made independently of other index cases. For instance, in the event that two or more people in the same household display flu-like symptoms, the decision for each of them visiting a doctor is made independently. The probability of each decision is also independent of any previous decisions made. To simulate scenarios where some intervention policies are not put in place, the associated probabilities are simply adjusted to reflect them accordingly.