CD9 and toxoplasmosis: To develop an efficient and inexpensive ELISA kit for toxoplasmosis diagnosis in pigs, our study tried to synthesize a multiepitope antigen (MAG) cDNA from five T. gondii-dominant antigens (SAG1, GRA1, ROP2, GRA4 and MIC3) and evaluate the possibility of applying the chimeric protein MAG to the ELISA diagnosis of T. gondii infection in pigs.