Wasps (ワスプ,wasupu?) of various species were infected with t-Virus strains. Wasps around Arklay County were infected with these viruses in a number of manners.
Mutant wasps were created in May 1998 after feeding on the pollen of Plant 42.[excerpt 1] Due to the accidental outbreak at the Arklay Laboratory, the staff were unable to control a mutant wasp nest, with at least one man succumbing to the poison. A wasp nest at a nearby abandoned hospital was also contaminated by suckling on the nectar of the Monster Plant, "Dorothy".