EXPERIMENTAL STUDY ON TISSUE TROPISM AND DISSEMINATION OF H9N2 AVIAN INFLUENZA VIRUS AND ORNITHOBACTERIUM RHINOTRACHEALE CO-INFECTION IN SPF CHICKENS - A. Azizpour; H. Goudarzi; S. Charkhkar; R. Momayez; M. H. Hablolvarid (Journal of Animal and Plant Sciences, 2014)