This family consists of several Theileria P67 surface antigens. A stage specific surface antigen of Theileria parva, p67, is the basis for the development of an anti-sporozoite vaccine for the control of East Coast fever (ECF) in cattle. The antigen has been shown to contain five distinct linear peptide sequences recognised by sporozoite-neutralising murine monoclonal antibodies [1].

1: Linear peptide specificity of bovine antibody responses to p67 of Theileria parva and sequence diversity of sporozoite-neutralizing epitopes: implications for a vaccine. Nene V, Gobright E, Bishop R, Morzaria S, Musoke A; Infect Immun 1999;67:1261-1266. PMID:10024569