作者单位:UCL, Div Infect & Immun, Inst Immun & Transplantat, London, England[1]St Louis Univ, Sch Med, Dept Mol Microbiol & Immunol, St Louis, MO USA[2]UCL, Inst Child Hlth & Great Ormond St Hosp, London, England[3]Duke NUS Med Sch, Program Emerging Infect Dis, Singapore, Singapore[4]Univ Hosp Pisa, Hepatol Unit, Pisa, Italy[5]Univ Hosp Pisa, Gen Med Liver & Digest Dis Unit, Pisa, Italy[6]