Reconsidered: catscratch disease, ecthyma contagiosum, milker's nodules, and biological agents may be conveniently classified as viral and rickettsial, bacterial, fungal, and parasitic. Potential occupational exposures are listed for each of the four groups. The following viral or rickettsial infections are considered: catscratch disease, ecthyma contagiosum, milker's nodules, newcastle disease, orinthosis, q fever, rabies, and rocky mountain spotted fever. The following bacterial infections are included: anthrax, brucellosis, erysipeloid, folliculitis, furunculosis, leptospirosis, listeriosis, plague, tetanus, tulearemia, and verruca necrogenica. The following fungal infections are considered: aspergillosis, chromoblastomycosis, coccidiodomycosis, histoplasmosis, moniliasis, mycetoma pedis, sporotrichosis, and tinea circinata. The following parasitic infections or infestations are considered: chigger bites, creeping eruption, fowl mite dermatitis, grain itch, and grocer's itch.