Robert Koch Helped Establish the Germ Theory of Disease by Discovering

Multiple Choice

Robert Koch helped establish the germ theory of disease by discovering that anthrax was caused by a disease. After he isolated and purified the same bacteria from several diseased animals, what would be the next step in order to show that this bacteria caused anthrax?

A) find out if antibiotics treat the diseased animals
B) perform physiological testing
C) culture the bacteria on Petri dishes
D) introduce the bacteria into a new mouse to see if it established the same infection
E) visualize the bacteria with an electron microscope