Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.1078.1079D AnjumAhmed RizviFarzana 3199923A respiratory syndrome causing heavy mortality in broilers is widespread throughout the country. It involves all ages of broilers mostly; layers are also susceptible. Initially there is sinusitis, followed by pneumonia, mucoid to haemorrhagic tracheitis and air-sacculitis. Mortality varies from 5 percent to as high as 70 percent. Target organs included all respiratory tract showing congestion, haemorrhages and necrosis. Tracheal epithelium contained basophilic intranuclear inclusions. Lungs showed multiple colonies of coca-bacilli. The disease appears to be virus-bacteria interaction.]]>Anjum, A.D.,1980Anjum, A.D.,19972nd Edn.,pp: 29-31pp: 29-31Anjum, A.D., M.A. Sabri and Z. Iqbal,1989124247248Calnek, B.W., H.J. Barnes, C.W. Beard, L.R. McDonald and Y.M. Saif,199710th Edn.,Pages: 527Pages: 527Jordan, F.T.W. and M. Pattison,19964th Edn.,pp: 173pp: 173