- « Virus are infectious agents around 150 nanometers in length. Only able to replicate inside the living cells of other organisms - their genetic makeup encourages unpredictable mutations. »
- — Virus Description, in the Plague Inc.: The Board Game
The Virus is a standard plague type introduced in version 1.0. It possesses a high natural tendency to mutate traits alongside its ability Viral Instability, but it struggles to neutralize these mutations. and so requires a different play-style that relies on fast enough infection to nullify any human counter-attack. The gene Darwinist best complements this natural ability, while Creationist can make the mutation rate seemingly more controllable. This is crucial as without the assistance of other genes, it can only mutate symptoms, and that free symptoms can help late game (especially Mega-Brutal) when the early transmission was properly handled. Additionally, devolving traits will cost DNA, increasing as more are done unless the Translesion + Gene is included to prevent the increment.
The special ability for Virus is Viral Instability. It makes DNA unstable, which further increases the number of random mutations to occur.
- The virus playable is said to have DNA; in real life, DNA viruses are relatively stable, while the RNA viruses are known to be genetically unstable, with differing degrees.
Stages of Evolution
|Standard Plague Types|