[1] Univ Tennessee, Dept Anim Sci, Knoxville, TN 37901 USA
[2] Osaka Univ, Inst Sci & Ind Res, Osaka, Japan
[3] Univ Washington, Dept Environm & Occupat Hlth Sci, Seattle, WA 98195 USA
[4] Calif State Univ Fullerton, Dept Biol Sci, Ctr Appl Biotechnol Studies, Fullerton, CA 92634 USA
[5] Tech Univ Denmark, Natl Vet Inst, Sect Bacteriol Pathol & Parasitol, Frederiksberg, Denmark
[6] Chinese Acad Sci, Inst Microbiol, CAS Key Lab Pathogen Microbiol & Immunol, Beijing, Peoples R China