I loved the beginning of this story. It reminded me of the Robin Cook fixation I had in junior high. Science and some mystery intertwined.
My suggestions for weaving in the actions to provide the backstory organically? Perhaps the Dr at the whiteboard could mentally rehearse some facts as easily as he could recite baseball stats? The fact that most people developed the disease by age 25 could be introduced and then she could reveal that she was 24??? Perhaps she could reveal at something that hints she has a relationship with the professor that differs from the other students? like saying, “Of course, he doesn’t show up when he knows I’m looking for him,” she muttered under her breath…???