Molecular epidemiology and pathogenicity of H5N1 and H9N2 avian influenza viruses in clinically affected chickens on farms in Bangladesh by Ripa, RN, Sealy, JE, Raghwani, J, Das, T, Barua, H, Masuduzzaman, M, Saifuddin, AKM, Huq, MR, Uddin, MI, Iqbal, M, Brown, I, Lewis, NS, Pfeiffer, D, Fournie, G, Biswas, PK