Galeno, H. et. al. (2002) Emerg. Infect. Dis. 8, 657 - 661. Meissner, J.D. et. al. (2002) Virus Res. 89, 131 - 143. Padula P.J. et. al. (2002) J. Gen. Virol. 83, 2117 - 2122. Schmaljohn, C. et al. (1997) Emerg. Infect. Dis. 3, 95 - 104.