Robertson P W, Kertesz V
J Clin Microbiol. 1975 Nov;2(5):461-2. doi: 10.1128/jcm.2.5.461-462.1975.
Using a modified fluorescent antibody technique immunoglobulin M antibodies to Toxoplasma gondii were studied in infants' sera. The modified technique involved prolonged incubation of patients' sera with antigen at 4 C.