Start with high-confidence diseases & illnesses books, then narrow by subgenre or adjacent topics.
Crisis in the Red Zone
Richard Preston
Tell Me When It's Over
Paul A. Offit MD, Paul A. Offit
Plague-busters!
Lindsey Fitzharris, Adrian Teal
Patient Zero
Marilee Peters
The Charon Club
Gina Bright, Gina M. Bright
The Fight of Our Lives: AIDS in America
David Levithan, Gabriel Duckels