An immunofluorescence method using
Crithidia luciliae was used to detect antibodies to double strand DNA in 131 patients including 48 with SLE. The findings were compared with data obtained using the PHA method. With the
Crithidia luciliae method, the positive rate was 100% in cases of active SLE, 22.9%, in inactive SLE and 6.0% in other diseases. On the other hand, with the PHA method, the rate was 92.3% in cases of active SLE, 45.7% in inactive SLE and 44.6% in other diseases. The
Crithidia luciliae method is thus more specific than the PHA method for the detection of double strand DNA. In the clinical course, titers of DNA antibodies detected by the
Crithidia luciliae method decreased more rapidly than was seen with the PHA method.
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