Eperythrozoonosis is an "acute febrile, icteroanemic disease of shoats" caused by the rickettsial organism Eperythrozoon spp. There are two species which are commonly associated with swine, E. suis, which produces a febrile disease, and E. parvum, which is innoxious.
Claxton, Marge and Kunesh, J. P.
"Eperythrozoonosis In Swine,"
Iowa State University Veterinarian: Vol. 37
, Article 4.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol37/iss3/4