I spend about half my time, he spends two thirds of his time, and she spends a quarter, or maybe a third, of her time on research.

It is difficult to identify Ebola in dead specimens.

Explanation:

When the monkey's abdomen is opened, she doesn't see what she expected. the narrator then walks through other places in the abdomen that would show signs of Ebola. There are none of the expected signs. The one problem that is seen is the "ring of bleeding spots". However, the narrator sees this as a possible sign of simian instead.