It's all on page 5 (with a couple other tidbits on page 7):
Discover A Cure
Once your team has discovered all four cures, you win!
If your pawn is in a city with a Research Station, discard 5 cards of the same color to cure the
corresponding disease. Take a Cure marker and place it (vial-side up) on the Discovered Cures area of the
board to indicate which disease has been cured. Place the spent cards into the Player Discard Pile.
Over the course of the game, your team can treat diseases to buy the time needed to discover cures.
Remove a disease cube from the city your pawn occupies. (Each removed cube costs one action.) Place the
removed cube back into the stock by the side of the board. If players have discovered a cure, instead of one
cube, remove all cubes of a cured disease in your current city for one action.
Eradicating a Disease
If a cure for a given disease has been discovered and all of the disease cubes of that color have been
removed from the board, flip the Cure marker for the disease to the “Sunset” side. From now on,
cards of this color have no effect when drawn on the Infector’s turn. Take all of the cubes of the
eradicated color and place them back in the box—they will not be used again for the rest of the game.
The Medic may remove all the cubes of a single color (instead of 1) when performing the Treat Disease
action. Also, if the Medic at any time finds herself in a city that contains cubes of a disease that has been
cured, she may immediately remove all of those cubes. This unique ability is in effect during all players’
turns and does not cost any actions to perform.
And a bit of confirmation on Page 7 during the example...
earlier in the game, so Brian
ignores the Seoul card. The Blue
and Black diseases are still a threat,
so Brian must add 1 cube each to
both Paris and Algiers in that order.
(Even though the Black disease is
Cured, it can still spread!)
Players collectively win the game immediately
when the cures for all four diseases (Blue, Yellow,
Black, and Red) have been discovered. Players do
not need to administer cures to every infected city
in order to win the game—victory is instant when
any player discovers the fourth and final cure.