The 201 diseases are caused by bacteria (47), chemicals (21), fungi (8), helminths (26), immune disorders (3), other agents (3), protozoa (11), rickettsiae (11), spirochetes (5), toxins (22), and viruses (44). Immune disorders include Guillain-Barre syndrome, which is closely associated with some infectious diseases, and hypersensitivity pneumonitis, which may present as a febrile outbreak. In the "Other" category are "Creutzfeldt-Jacob disease," "Mass psychogenic illness," and "Radiation sickness, acute." 

Each of the 201 diseases is also placed in one of the following 16 categories: 

	Arthropod-Borne (34)
	Biological Weapons (11)
	Chemical & Nuclear Weapons (6)
	Childhood Infections (19)
	Community-Acquired (27)
	Foodborne--Fluke (4)
	Foodborne--Intestinal Nematode (5)
	Foodborne--Intoxication (9)
	Foodborne--Tapeworm (3)
	Foodborne--Tissue Nematode (5)
	Gastroenteritis, Inflammatory (7)
	Gastroenteritis, Noninflammatory (6)
	Occupational (19)
	Sapronoses (14)
	Sexually-Transmitted (7)
	Zoonoses (25)

For an interesting discussion of infectious disease categories, see: Hubalek Z. Emerging Infectious Diseases: Anthroponoses, Zoonoses, Sapronoses. Emerg Infect Dis 2003 Mar. Available from: URL: http://www.cdc.gov/ncidod/EID/vol9no3/02-0208.htm.