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J Clin Microbiol. 1988 November; 26(11): 2444-2446

Latex agglutination test for detection of antibodies to Toxoplasma gondii.

Gull Foundation for Medical Research, Gull Research Park, Salt Lake City, Utah 84117.

ABSTRACT

A resurgence of interest in Toxoplasma gondii has occurred because this coccidian parasite causes lethal infections in immunologically compromised hosts and is responsible for at least 3,000 congenitally infected infants in the United States annually. Thus, rapid, specific, and inexpensive serologic tests are required for routine screening of patients, especially pregnant women. We have developed a latex agglutination test for antibodies to T. gondii which utilizes covalently coupled T. gondii antigens. When compared with an indirect immunofluorescence assay, the latex test had a sensitivity of 94% and specificity of 100%. Compared with an enzyme-linked immunosorbent assay, the latex test had 86% sensitivity and 100% specificity. When testing samples which exhibited nonspecific polar staining by the immunofluorescence assay, the enzyme-linked immunosorbent assay had a 50% false-positive rate, whereas the latex agglutination test yielded no false-positive results. Thus, the latex agglutination test provided an efficacious method for routine serological screening for antibodies to T. gondii.

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