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The Necroa Virus is an expansion pack that was released with the Mutation 1.5 update. It is a stereotypical zombie virus.

The Necroa Virus is a special plague type that has aggressive metabolic demands, and "extreme regenerative capabilities." Its most notable trait is that when it infects humans and kills them, they will reanimate and become "undead" zombies (if the Cytopathic Reanimation symptom has been evolved via mutation or DNA points). The plague can be unlocked by purchasing it for $1.99 USD, by beating the Neurax Worm disease type on brutal for mobile devices, or by beating the Prion disease on normal or higher in Plague Inc: Evolved.

Game overview

The Necroa Virus itself is very easy to cure in general. This is countered by Cytopathic Reanimation, which causes any dead infected person thereafter to have the chance to reanimate as a zombie. Zombies cannot be cured. This symptom leads to various abilities and symptoms that will increase the effectiveness, or severity of the zombies. It is useful to evolve this at before 85%, as more time means more zombie foothold.

After a some time, a Z Com base will be installed in a random country. Z Com will try to eradicate your zombies, and Z Com will get stronger as time goes by, and will establish additional bases in other healthy countries, affecting the countries they are in. Thus, it is imperative to attack the new and inexperienced Z Com base.

Zombies in a destroyed country starve and die quickly, so Zombie Horde should be used to move them. This is indicated by a zombie bubble. Make sure the number of zombies is high before attacking a base, or else they will be massacred. Once Z Com is eliminated, and all humans are either killed or turned into zombies, the game ends and the player wins.

There is also a hidden in-game origin story for the Necroa Virus.

  • If Egypt is infected first, a popup may appear saying that explorers are going deeper into the newly-discovered tombs of Giza. The hieroglyphics will warn the explorers of an ancient plague capable of destroying humanity. The mummy excavated will have "strange bite marks." When zombies infect the world, a news headline may pop up saying that the Necroa Virus may have come from the Pyramid of Giza, indicating that the Necroa Virus is much older than Patient Zero.
  • If the USA is infected first, a popup can appear saying that DarkWater (scientific research group) is missing a scientist, meaning that Patient Zero could be this scientist. Later on, other popups will say that DarkWater has created the Necroa Virus, and another one saying that they are planning to make a kind of "zombie pacifier."
  • If a player infects the UK first, it may say that PfiGlax (another scientific research group) made the Necroa Virus.
  • Lastly, if the Plague is started in Ukraine, theories will begin circulating that the Necroa Virus was created by the Chernobyl nuclear disaster.

Each of the storylines will have three achievements for completing it.



Track Name Audio
Adverse Reactions
Z Com Falls


Stages of infectivity


Special Plague Types
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Necroa Virus