Turkey coryza 5 Avian colibacillosis 12 Anatomy of the avian respiratory tract 15 PAPER I. EFFECTS OF BORDETELLA AVIUM INFECTION ON THE PULMONARY CLEARANCE OF ESCHERICHIA COLI IN TURKEYS 18 SUMMARY 20 Necropsy procedure 24 Bacterial quantitation Microtiter agglutination test Histopathology Statistical analysis RESULTS 27 ill Bacterial numbers In tissue 27 Lesions 28 Serology 30 DISCUSSION 40 REFERENCES 43 PAPER II. INFLUENCE OF BORDETELLA AVIUM INFECTION ON ADHERENCE AND COLONIZATION OF ESCHERICHIA COLI IN THE TURKEY TRACHEA 46 SUMMARY 48 MATERIALS AND METHODS 51 Experimental design 51 Turkeys " 51 Bacteria and culture conditions 52