TABLE 1.

RPR and treponemal test reactivities detected in the panel of negative control seraa

Specimen category (no. of samples)% Reactivity (no. of samples reactive or equivocal/total no. tested)
RPRCLIAEIATPHAWB
Blood donors (2494)2.77 (69/2,494)0.12 (3/2,494)0.04 (1/2,494)00.04 (1/2,494)
Lyme disease (30)0003.33 (1/30)0
Streptococcus pyogenes infection (10)10 (1/10)0000
Mononucleosis (10)10 (1/10)0000
Pregnant women (5)20 (1/5)0000
ANA positive (16)12.5 (2/16)0000
RF positive (10)10 (1/10)0000
T. denticola positive (15)00000
Total (2,590)2.90 (75/2,590)0.12 (3/2,590)0.04 (1/2,590)0.04 (1/2,590)0.04 (1/2,590)
  • a Treponemal tests used were LIAISON Treponema Screen, syphilis screening recombinant EIA, TPHA, and WB. Negative control sera were samples from blood donors and cross-reacting samples. ANA, antinuclear antibody; RF, rheumatoid factor.