| nephropathogenic infectious bronchitis in pennsylvania chickens 1997-2000. | nephropathogenic infectious bronchitis (nib) was diagnosed in 28 infectious bronchitis virus (ibv)-vaccinated commercial chicken flocks in pennsylvania from december 1997 to july 2000. early dinical signs were increased flock mortality and urinary water loss (polyuria and pollakiuria) leading to wet litter. daily mortality ranged from 0.01% in layers to 2.45% in broilers, with total broiler mortality as high as 23%. severe renal swelling and accumulation of urates in the tubules were commonly se ... | 2002 | 12495045 |