The health of farmers.
D000059:Accidents; D000382:Agricultural Workers' Diseases; D000818:Animals; D000900:Anti-Bacterial Agents; D005203:Farmer's Lung; D006311:Hearing Disorders / Q000209:etiology; D006801:Humans; D007484:Iowa; D007938:Leukemia / Q000453:epidemiology; D009622:Noise / Q000009:adverse effects; D012832:Silo Filler's Disease; D014732:Vibration / Q000009:adverse effects; D015047:Zoonoses
D000900:Anti-Bacterial Agents