title: No interference of rheumatoid factor(s) with toxoplasmosis IgM determination in infancy.
abstract: Sera from 263 newborns and infants suspected of congenital toxoplasmosis were tested for the presence of rheumatoid factor (RF) by the latex agglutination test, of which 40 were also tested by the enzyme-linked immunosorbent assay (ELISA). RF was detected in only one serum sample (0.38%), suggesting that false-positive results of the IgM-indirect fluorescent antibody test and the IgM-ELISA due to RF is most unusual in infancy.
authors.affiliation: Toxoplasmosis Research Laboratory, Institute for Medical Research, Belgrade, Yugoslavia.
authors.forename: O
authors.initials: O
authors.lastname: Djurković-Djaković
authors.forename: N
authors.initials: N
authors.lastname: Milosević-Jovcić
authors.forename: S
authors.initials: S
authors.lastname: Zerjav
authors.forename: D
authors.initials: D
authors.lastname: Sibalić
mesh_terms: D004797:Enzyme-Linked Immunosorbent Assay; D005189:False Positive Reactions; D006801:Humans; D007075:Immunoglobulin M / Q000302:isolation & purification*; D007223:Infant; D007231:Infant, Newborn; D007841:Latex Fixation Tests; D012217:Rheumatoid Factor / Q000302:isolation & purification*; D014125:Toxoplasmosis, Congenital / Q000276:immunology*
chemical_list: D007075:Immunoglobulin M; D012217:Rheumatoid Factor