[5] Khare M D, Sharland M. Exp. Opin. Pharmacother, 2000, 1(3): 367.

[6] Cox N J, Subbarao K. Lancet., 1999, 354(9186): 1277.

[12] CANN A J. Virus Culture A Practical Approach. New York: Oxford University Press. 1999.

[13] Deba Prasad Nayaka, Udo Reichl. Journal of Virological Methods, 2004, 122: 9.

[14] Potier M, Mameli L. Anal. Biochem., 1979, 94: 287.