Similar to the index cases, contacts are handled according to a decision flowchart as shown in figure 3. Upon being traced, the person will be offered prophylaxis-giving a person who is not obviously sick a course of antiviral drugs, so as to prevent him/her from being infected, or to reduce the severity of the illness when he/she does get infected. Again, there is a 95 per cent chance of the person consuming the medication. The prescription to be given is 1 dosage per day, for 10 days.