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USDA ARS, Beltsville Agr Res Ctr, Inst Livestock & Poultry Sci, Parasite Biol & Epidemiol Lab, Beltsville, MD 20705 USA USDA ARS, Beltsville Agr Res Ctr, Inst Livestock & Poultry Sci, Parasite Biol & Epidemiol Lab, Beltsville, MD 20705 USA