This variation of the transmission ,allows bats to host a strain of the Nipah Virus which can infect people, and it is evolved by default.
This variation of the transmission, allows bats to be infected in Necroa Virus, which are hard to detect. This also increases infectivity and the chance of a mutation.
- With its fellow transmission Bat 2 and the symptom Vampiric Hunger, it can form the Vampire Bat symptom combo. However, this is only possible in the Necroa Virus DLC.
As with all Shadow Plague transmissions, Bat 1 can only be evolved once the symptom Shadow Blessing has been evolved.