Does a player need to complete a full turn (i.e. 4 actions, pickup, infect) if during the action portion the final disease was cured? I only ask because there was only 1 player card left in the deck and I wouldn't have been able to complete a full turn, which in the rules, signifies that players have lost. However, I knew that I could cure the final disease in one action.
You won. The rules state that in order to win, you must discover the cure to all 4 diseases. The moment you discover the 4th cure, the game ends and you win.
From the rules:
The players win as soon as cures to all 4 diseases are discovered.
The players do not have to eradicate all 4 diseases to win; just cure them. Once all diseases are cured, the game ends and players win immediately, no matter how many cubes are on the board.