Bat 2 is a transmission found in the Necroa Virus DLC, the Shadow Plague DLC, and the Nipah Virus scenario. It allows bats to mob humans at night in the Necroa Virus DLC. The attacks can be lethal.
- In the scenario Nipah Virus, Bat 2 doesn't lead to lethal attacks and instead only increases infectivity. Instead it takes until the mutation Bat 4 before lethality increases due to bat attacks.