“…Several hundred million people are affected by this parasite and certainly a considerable number of them have become infected due to occupational contact with contaminated water during cultivation of rice, fishing, and other activities [WHO Report, 1980;Garfield, 1986a,b]. The other important animal agents are: parasitic and allergenic mites [Cuthbert et al, 1979;&owski, 19761; ixodid and argasid tick vectors of viral and bacterial diseases, representing a hazard for forestry and agricultural workers [ASmera and Heinz, 1973;WHO Report, 19851; insects bearing allergic or toxic particles that affect mostly entomologists but also forestry and agricultural workers [Wirtz, 19841; poisonous sea animals (sponges, coelenterates, fishes, snakes) that may be dangerous for seamen and fishermen [ILO, 1983;Kizer, 19841; poisonous terrestrial animals (spiders, snakes) presenting serious risk for plantation workers of hot climates [ILO, 19831; and airborne allergenic particles derived from mammals and birds (consisting of urine, feces, hair, saliva, dander, feathers) affecting laboratory animal care workers, animal farmers, and workers in animal processing facilities Frazier, 19801.…”