The role of Toxoplasma in causing uveitis, especially retinochoroiditis, is now well accepted. It was established by statistical analysis of the high frequency of positive toxoplasmin reactions and serologic (dye) tests in patients with ocular lesions,1-3 by the discovery of parasites morphologically identical with Toxoplasma in sections of enucleated eyes,4,5 and by isolation of the organism from ocular tissues.6-8 The diagnosis of each patient with retinochoroiditis remains difficult, however, as tests based on serum antibody only do not provide definitive answers for the following reasons: