Exsurgent bionanobots are transmitted like other pathogens, via dermal, inhalation, injection, or oral methods (p. 317, EP). Chance/random exposure in a contaminated area occurs on a failed MOX x 10 Test.
Exposed biomorphs must make an Opposed Test, pitting their Durability vs. the pathogen’s Infection Rating. Toxin filters and medichines provide a +30 bonus. If the pathogen wins, they are infected.