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Number of positives in the two different parvovirus B19 EIAs. No difference was seen between the 99 SLE patients and the 99 controls with the IgG VP1/VP2 EIA (Progen), 49% of the SLE patients were positive compared with 46% of the controls. The VP2 EIA (Biotrin) was more sensitive and in this case the controls were significantly more often positive than the SLE patients (p = 0.027), 65% of the SLE patients were positive compared with 79% of the controls.
