Eimeria meleagrimitis is a species of Eimeria that causes congestion or petechia from the duodenum to the ileum with dilation of the jejunum and mucosal cast in the small intestines of turkeys. This moderate to severe pathogen is confirmed on necropsy followed by scrapings to view the oocysts under a microscope. Infection is more common in young turkeys (poults), causing birds to appear unthrifty, suffer dehydration, and lose weight, leading to morbidity or mortality.