Pathogenic disease will be defeated by medical nanorobots

Ray Kurzweil : futurist
The threat posed by genetically engineered pathogens ill permanently dissipate by the end of 2020's as medical nanobots - infinitely more durable, intelligent and capable than any microorganism - will become sufficiently advanced.

Kurzweil, Ray. 2005. The singularity is near: when humans transcend biology. New York: Viking.