[1] Baranya Cty Inst, State Public Hlth Serv, Reg Lab Virol, H-7623 Pecs, Hungary
[2] Univ Pecs, Fac Med, Dept Med Microbiol & Immunol, Pecs, Hungary
[3] Municipal Szent Laszlo Hosp Infect Dis, Dept Pediat, Budapest, Hungary
[4] Semmelweis Univ, Fac Med, Dept Pediat 1, Budapest, Hungary
[5] Eastern Virginia Med Sch, Childrens Hosp Kings Daughters, Ctr Pediat Res, Norfolk, VA 23501 USA