The doctor has to discover who the virus is before the virus runs out of ‘victims’
The leader chooses one camper to be the doctor.
The doctor has to turn their back to the group or leave the area while the leader chooses another camper to be the virus.
The campers (except for the doctor) are assembled in the same area and told to walk around and shake each other’s hands. As the virus is shaking hands they must randomly scratch the palm of another camper’s hand.
The scratched camper continues to shake 3-5 more hands then sits down (or lays down and plays ‘dead’). The doctor has three guesses to discover who the virus is.