Surveillance for in Hunter-Harvested Wild-Elk () from Pennsylvania, USA (2016-2017).

is a tick-borne protozoal parasite which infects the erythrocytes of members of the families Cervidae and Bovidae. Infection can result in hemolytic anemia, lethargy, anorexia, and death. The reservoir host of is the white-tailed deer (); however, infections with overt disease have only been documented in reindeer (), caribou () and captive elk ().