LABORATORY EXAMINATION
The Treponema pallidum Particle Agglutination Test (TPPA) was positive, with a value of 22.56 s/co. The Rapid Plasma Reagin Ring Card Test (RPR) was positive, with a titer of 1:64. Syphilis serological analysis of her parents, two grandparents, and one grandmother were negative. However, one grandfather was TPPA and RPR positive, with a titer of 1:16.