Build a Research Station: discard the City card that matches the city you are in to place a research station there. Take the station from the supply. If all 6 research stations have been built, take a research station from anywhere on the board.
Treat Disease: remove 1 disease cube from the city you are in, returning it to the supply. If this disease color has been cured (see Discover a Cure), remove all cubes of that color from the city you are in.
If there are cubes from several cured diseases in a city, you must still Treat Disease once for each cured color to remove these cubes.
If the last cube of a cured disease (the cure was discovered already) is removed from the board, this disease is eradicated. Its Cure marker in the info bar will change to reflect this.
The Share Knowledge action can be performed in two ways:
- give the City card that matches the city you are in to another player, or
- take the City card that matches the city you are in from another player.
The other player must also be in the city with you.
If the player who gets the card now has more than 7 cards, that player must immediately discard a card or play an Event card (see Event Cards).
Discover a Cure: at any research station, discard 5 City cards of the same color from your hand to cure the disease of that color. The disease's Cure marker will appear in the info bar. This disease is now cured.
If no cubes of this color are on the board, this disease is now eradicated. Its Cure marker in the info bar will change to reflect this.
Notes:
Eradicating a disease is not needed to win. However, when cities of an eradicated disease are infected, no new Disease cubes are placed there (see Epidemics and Infections). Removing the last cube of a disease that is not cured has no effect.
When a disease is cured, its cubes remain on the board and new cubes can still be placed during epidemics or infections (see Infect Cities). However, treating this disease is now easier and you are closer to winning.