Artificial Organs is a scenario added in the Mutation 1.8 update. Due to the nature of the scenario, it cannot be played on special plagues.
At the beginning of the game, a popup will show saying "Artificial Organs adored by the world." When a disease is spotted and has lethal symptoms, a popup will appear saying "Artificial Organs to save lives." The lethality of the plague will be reduced significantly, and they will continue to do so for the rest of the game unless the players counter it. The lethality reduction is enough to counter even the Bio-Weapon's Unlock Annihilate gene and the evolution of normally end-game symptoms like Total Organ Failure and Hemorrhagic Shock. Harder difficulties seem to decrease the lethality more each time a new batch of organs is received.
How to counter Artificial Organs
To stop the Artificial Organs from decreasing a plague's lethality, players must evolve both the Insanity and Hyper Sensitivity symptoms after the "save lives" popup. After players do this, a popup will show up, saying "Victims of
<plague name> rip out organs". This means players have successfully countered the artificial organs, and their plague's lethality won't be reduced anymore after that. In fact, plague's lethality will actually gradually increase after evolving Insanity even if no more symptoms appear.
|Scenarios in Plague Inc. and Plague Inc. Evolved|
|▪ Artificial Organs ▪ Black Death ▪ Created Equal ▪ Fake News ▪ Flight Club|
▪ Frozen Virus▪ Global Warming ▪ Golden Age ▪ Ice Age
▪ Mad Cow Disease ▪ Mirror Earth ▪ Nipah Virus ▪ Pirate Plague ▪ Santa's Little Helper
▪ Science Denial ▪ Shut Down Everything ▪ Smallpox ▪ Sovereign Default
▪ Swine Flu ▪ Teleportation ▪ Ultimate Board Games ▪ Unknown Origin ▪ Volcanic Ash
▪ Who Cares ▪ Where Is Everyone? ▪ Xenophobia ▪ Custom Scenarios