作者单位:Washington State Univ, Dept Vet Clin Sci, Pullman, WA 99164 USA[1]Washington State Univ, Gene & Voiland Sch Chem Engn & Bioengn, Pullman, WA 99164 USA[2]Washington State Univ, Paul G Allen Sch Global Anim Hlth, Pullman, WA 99164 USA[3]Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA[4]