[1] Taipei Vet Gen Hosp, Div Infect Dis, Dept Med, Taipei 11217, Taiwan
[2] Natl Yang Ming Univ, Inst Clin Med, Sch Med, Taipei 112, Taiwan
[3] Chutung Vet Hosp, Dept Med, Chutung, Taiwan
[4] Taipei Vet Gen Hosp, Immunol Res Ctr, Taipei 11217, Taiwan