Academic International Journal of Veterinary Medicine

“Chronic respiratory disease” in hens and “infectious sinusitis” in turkeys are both caused by the same pathogen, “Mycoplasma gallisepticum” (MG). It was spread through eggs and led to processing performance, decreased feed efficiency and egg production, and expensive control measures; double tracheal swabs were obtained from 120 commercial chickens with a mean of 5.5 weeks between February 2020 and August 2021 and tested for Mycoplasma gallisepticum at Karbala city (Iraq) from chicken detailed history, and all complaint concerning the caseous exudate accumulation in the trachea was inoculation in the modified Frey's broth (PPLO) medium for Mycoplasma culturing and histological analysis, sterile scissors removed necropsy chicken parts like the trachea and lung were inoculated with 10% formalin for histological evaluation. The results were found under an X10 dissecting microscope; colonies resembling a fried egg confirmed the incidence of Mycoplasma gallisepticum in 39 out of 120 layer fowl poultry tested, a histopathological slice of trachea exhibits epithelial layer sloughing and necrosis as well as poultry lung histopathology demonstrates severe fibrinous bronchopneumonia and constriction of pulmonary airways and pulmonary hemorrhage.