title: False-positive IgM anti-toxoplasma fluorescent test due to rheumatoid factor.
mesh_terms: D000293:Adolescent; D002850:Chromatography, Gel; D005189:False Positive Reactions; D005455:Fluorescent Antibody Technique; D006801:Humans; D007075:Immunoglobulin M / Q000302:isolation & purification*; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D008297:Male; D012217:Rheumatoid Factor / Q000302:isolation & purification*; D014122:Toxoplasma / Q000276:immunology*
chemical_list: D007075:Immunoglobulin M; D012217:Rheumatoid Factor