A Case of Cystic Endometrial Hyperplasia and Open Cervix Pyometra Due to Mannheimia haemolytica in a Queen

This case report investigated a case of cystic endometrial hyperplasia and open cervix pyometra (CEH+P) in a 5-

year-old, unspayed, nulliparous tabby cat complaining of vaginal discharge, anorexia, and high fever. According to the

patient's owner's anamnesis, it was reported that the cat had no appetite, was stagnant, and had purulent discharge from

the vagina. On ultrasound examination, the cat was diagnosed with cystic endometrial hyperplasia. Because the recurrence

rate was high despite treatment of the disease, an ovariohysterectomy was performed with the owner's consent. After

surgery, samples were collected from the uterus under sterile conditions for microbiological examination. In the microbiological examination, Mannheimia haemolytica (M. haemolytica) was isolated and the conventional bacteriological

diagnosis was confirmed by molecular examination. In conclusion, M. haemolytica may be the etiologic cause of cases of

cystic endometrial hyperplasia and open cervix pyometra (OCP) in tabby cats.