| infectious coryza in meat chickens in the san joaquin valley of california. | two cases of infectious coryza in meat chickens are reported. the first case involved 6-week-old broiler chickens in which only haemophilus paragallinarum was isolated. the second case involved 11-week-old roaster chickens in which h. paragallinarum and mycoplasma synoviae were isolated. both farms were in close proximity to layer-chicken farms where infectious coryza had been previously diagnosed. in both cases, only certain houses on the farm were affected, and mortality in these houses increa ... | 1990 | 2282006 |