[1] USDA, BARC E, Livestock & Poultry Sci Inst, Immunol & Dis Resistance Lab, Beltsville, MD 20705 USA
[2] Virginia Maryland Reg Coll Vet Med, College Pk, MD 20742 USA
[3] Ctr Agr Biotechnol, College Pk, MD 20742 USA
[4] Seoul Natl Univ, Coll Agr & Life Sci, Dept Anim Sci & Technol, Suwon 441744, South Korea
[5] Dexall Biomed Labs Inc, Gaithersburg, MD 20879 USA