The extent to which an organism or ecological community would suffer from a threatening process or factor if exposed, without regard to the likelihood of exposure
Giardiasis is a disease caused by infection with the protozoan Giardia lamblia. Infection with Giardia can produce diarrhea, gas, and abdominal pain in some people.
Friedrich Loeffler was the first to cultivate Corynebacterium diphtheriae and used Koch's postulates to confirm it as the agent that caused diphtheria.