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Journal Article
Research Support, U.S. Gov't, P.H.S.
Infrequent detection of Toxoplasma gondii genome in toxoplasmic lymphadenitis: a polymerase chain reaction study.
Human Pathology 1992 Februrary
The diagnosis of toxoplasmic lymphadenitis is currently established by histologic evaluation with confirmation by serologic studies. We used a sensitive and specific polymerase chain reaction methodology for the identification of toxoplasmic genomes previously reported by others to investigate whether this technology could contribute to the diagnosis. We were able to reliably detect toxoplasmic genomes in paraffin-embedded tissues of toxoplasmic encephalitis and myocarditis, and serial dilution studies indicated a high degree of sensitivity. Nonetheless, we identified toxoplasmic genomes in frozen tissue from only one of nine cases of toxoplasmic lymphadenitis. In the one positive case, only one of three frozen samples from the lymph node biopsy was positive, indicating a focal infection within the lymph node. It is concluded that polymerase chain reaction studies, at their current level of sensitivity, are not of great use in contributing to the evaluation of cases of suspected toxoplasmic lymphadenitis, which continues to be best diagnosed by accurate histopathologic examination.
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