Start with high-confidence diseases & illnesses books, then narrow by subgenre or adjacent topics.
Terrible Typhoid Mary
Susan Campbell Bartoletti
Mountains Beyond Mountains (adapted for Young People)
Tracy Kidder, Michael French
Bless the Blood
Walela Nehanda
Very, Very, Very Dreadful
Albert Marrin
One in a Million: a Graphic Memoir
Claire Lordon
Patient Zero
Marilee Peters
The Fight of Our Lives: AIDS in America
David Levithan, Gabriel Duckels