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Frey S, Dagan R, Ashur Y, Chen XQ, Ibarra J, Kollaritsch H, Mazur MH, Poland GA, Reisinger K, Walter E, Van Damme P, Braconier JH, Uhnoo I, Wahl M, Blatter MM, Clements D, Greenberg D, Jacobson RM, Norrby SR, Rowe M, Shouval D, Simmons SS, van Hattum J, Wennerholm S, O’Brien Gress J, Chan I. Reply. J Infect Dis. 2000 Sep;182(3):1005–1006.