Prevalence of antibodies against avian influenza A (H5N1) virus among Cullers and poultry workers in Ho Chi Minh City, 2005. by Schultsz, C, Nguyen, V, Hai, LT, Do, Q, Peiris, J, Lim, W, Garcia, J, Nguyen, D, Nguyen, T, Huynh, H, Phan, X, van Doorn, H, Nguyen, V, Farrar, J, Jong, d