Assessing evidence for avian-to-human transmission of influenza A/H9N2 virus in rural farming communities in northern Vietnam by Hoa, L, Tuan, N, My, P, Huong, T, Chi, N, Hau Thu, T, Carrique-Mas, J, Duong, M, Tho, N, Hoang, N, Thanh, T, Diep, N, Duong, N, Toan, T, Tung, T, Mai, L, Iqbal, M, Wertheim, H, van Doorn, H, Bryant, J