Beware of the disease
This game requires 2 sets of cards in different colours (homemade or playing cards).
2 participants becomes infected with one disease each (plague or colera), and gets a set of card each. They now has to touch the rest of the participants. Anyone caught gets some of the cards, and must help spreading the disease. If anyone ends up with only one card, they are not able to catch anyone. If anyone has caught one disease, they can not get the other.
When everyone has been caught the 2 teams count how many has each disease. The team with most infected has won.