How come I lose the game when all hosts die, even if I have the Necrosis upgrade?

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In Plague Inc, you can lose if all the hosts of your disease die. But the Necrosis upgrade allows people to get the disease from corpses. So if everyone with the disease dies while I have the Necrosis upgrade, shouldn't the game continue since I can still transmit the disease?
Best Answer
It's kinda just game logic, a punishment for over evolving your disease. Really the only way to explain this is if they burned bodies or quarantined people.
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Plague Inc: Custom Scenarios - The Grim Reaper
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