A cross sectional study of Infectious Bursal Disease and Newcastle Disease in poultry in Narsingdi district of Bangladesh oleh Shariful Islam, Ariful Islam, Shahnaj Parvin Moni, Md. Saiful Bari, Kamrul Islam, Shovon Chakma, Md. Ershad Hossain, Md. Zannatul Ferdous Siddiqe, Muhammad Belal Hoassain, Sharmin Chowdhury