Pasteurella multocida and Mannheimia haemolytica are the known bacterial pathogens, which cause severe respiratory diseases of sheep.So, this work intended to detect Pasteurella pathogens involved in sheep respiratory infections using culturing method, biochemical tests and PCR assay.To realize this, 75 samples of nasal swabs collected from clinically diseased sheep at Sohag Governorate.These samp...