In 2005 the creators of World Of Warcraft the Blizzard Entertainment based in California released a flue like disease that got everybody’s attention.
It was soon a full blown epidemic since the players in Word of Warcraft should interact with each other like normal daily life. The characters in the game were dying off in a rapid speed.
The game pandemic can actually be used to study real human behavior even if we lack the healing power in the game; we still have the doctors that can help. The healers in the game traveled to the areas where the pandemic came from because they wanted to help.
In real life this might be the right thing to do but in the game world of monsters and heroes you maybe should let them die since you will only spread the diseases when the character travels to places in the game.
But maybe some disease in the real world should be treated that way as well, if the disease is so deadly and fast it maybe kills itself. If people like journalists and doctors they might take the disease with them back on the plane and infect the rest of the world. If they left it die for itself it would have stopped there and then.