The Centers for Disease Control deal with diseases of all kinds, including those caused by bacteria, eukaryotes and viruses. The focus here is on viruses, the definition of living vs. non-living and non-viral, disease-causing microorganisms.
Introduction to the CDC Museum
Image: Electron micrograph of HIV. "Cone-shaped cores are sectioned in various orientations. Viral genomic RNA is located in the electron-dense wide end of core." - CDC web site