Abstract
Domestic and native animals were surveyed for screwworm, Cochliomyia hominivorax (Coquerel) and torsalo, Dermatobia hominis (L., Jr.) myiasis during the 1985 rainy season on the Yucatan Peninsula, Mexico. Three types of situations were surveyed as follows: family-unit ranches; feedlots; and captive, indigenous animals. A total of 989 Dermatobialesions and 87 screwworm-infested wounds were recorded. Highest prevalence of Dermatobia and screwworm myiasis occurred in cattle and domestic pigs, respectively. Dogs also had a high rate of parasitism by both insects. Among native animals, torsalo lesions were most often seen in deer. Only one case of torsalo myiasis was recorded in humans. People living on ranches, although near infested animals, are probably still not as susceptible to myiasis as people who work directly in forested areas. None of the Dermatobia lesions recorded in this survey was subsequently infested by screwworms. Such lesions are probably much less attractive to screwworms than are other common types of wounds.
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