From publisher blurb:
odern Maladies provides an in-depth look into the hazards of disease and illness in a d20 Modern campaign. Some of the physical ailments presented in this product derive from pure fiction, but many also exist in real-life - including biological weapons, chronic conditions, and worldwide epidemics. For the authentic diseases, defining their effects in game terms can never fully characterize their impact on actual sufferers of such conditions. Even so, most GMs should find Modern Maladies useful for introducing new challenges and realistic hazards for their modern heroes to encounter.
This PDF contains 30 real world diseases, 10 fantasy/sci-fi diseases, several templates for monsters created by disease, and the Advanced Class: CDC Specialist.