Wiktionary
transmittable
a. 1 able to be transmitted 2 transmissible
WordNet
transmittable
adj. (of disease) capable of being transmitted by infection [syn: catching, communicable, contagious, contractable, transmissible]
Usage examples of "transmittable".
If anything, the symptomology here is closer to transmittable spongiform encephalopaly, a disease that incubates silently over dozens of years.