Pasteurella haemolytica as a Co-Pathogen in Pullets and Laying Hens

Pasteurella haemolytica was isolated from internal organs of laying hens and pullets of four flocks in which five incidents of increased mortality had occurred. There was inflammation of the trachea in all cases, and infectious laryngotracheitis virus was identified in three of the incidents. Rapid response to antimicrobial therapy was seen in two out of three outbreaks in the pullets. P. haemolytica was regarded as a significant secondary invader in these cases. /// Se aisló Pasteurella haemolytica de los órganos internos de ponedoras comerciales y pollonas a partir de cuatro lotes donde se observó un aumento de mortalidad en cinco ocasiones. Se presentó inflamación de la tráquea en todos los casos y se identificó el virus de laringotraqueítis infecciosa en tres de los casos. En las pollonas se observó una respuesta rápida a la terapia antimicrobiana en dos de los tres brotes. Se consideró la P. haemolytica como un invasor secundario de significancia en estos casos.