Newly developed diagnostic kit for toxoplasma infection, Platelia Toxo IgG, IgM and IgA were compared with IFA IgG and IgM, revealing high co-positivity between the results obtained by the two methods. 2. The serum containing antinuclear antibody, rheumatoid factor and so on, which are often regarded as cause of false positive results, showed no nonspecific reaction completely. 3. Platelia Toxo IgM and IgA were applied for the serum obtained from the patients who were laboratory infected and/or acquired toxoplasma infection, most of the specimen revealing IgM and IgA antibody at the acute stage of the infection.