Nucleotide sequences of the nonstructural protein NS1 gene of three dengue-2 viruses, M1, M2 and M3, isolated in Malaysia from patients with dengue haemorrhagic fever, dengue shock syndrome and dengue fever, respectively. - Fong, M.Y.; Koh, C.L.; Samuel, S.; Pang, T.; Lam, S.K. (Oxford University Press, 1990)