Emergence of the Asian 1 genotype of dengue virus serotype 2 in viet nam: in vivo fitness advantage and lineage replacement in South-East Asia by Vu, TT, Holmes, EC, Duong, V, Nguyen, TQ, Tran, TH, Quail, M, Churcher, C, Parkhill, J, Cardosa, J, Farrar, J, Wills, B, Lennon, NJ, Birren, BW, Buchy, P, Henn, MR, Simmons, CP