title: Evidence that piroplasms can undergo antigenic variation.
mesh_terms: D000818:Animals; D000941:Antigens; D001404:Babesiosis / Q000276:immunology*; D014644:Genetic Variation; D007114:Immunization; D007125:Immunogenetics; D008297:Male; D051381:Rats
chemical_list: D000941:Antigens