Dr Deepak Prasad Sinha, Poultry Consultant, Patna. INTRODUCTION Infectious bronchitis (IB) is a contagious and a very serious respiratory viral disease of poultry. It is one of the most common viral infections of chickens all over the world. The virus is believed to, a part from respiratory diseases, cause urogenital tract disease of birds. Infectious … Continue reading INFECTIOUS BRONCHITIS (IB) IN COMMERCIAL POULTRY BIRDS