IL5 and cyst: Apart from CP12, several H-fused antigens have already been produced in E. coli (Conceição et al., 2010) and immunized in mice and rabbits, such as, the human interleukin-5 (IL-5), the cyst wall protein-1 from T. gondii (TgOWP), the cyst wall protein from Giardia lamblia cysts (CWG), the β-giardin cytoskeletal protein of the ventral disk from the G. lamblia trophozoite (βG), the cyst wall specific-glycoprotein Jacob from Entamoeba histolytica (Ent), and the falcipain-1 trophozoite cysteine proteinase from Plasmodium falciparum (Pfsp), among others (Conceição et al., 2011).