FIG. 3.

Relationship of the reactivities of the syphilis patient sera to the VDRL test and to recombinant T. pallidum proteins. The mean absorbance values of the syphilis patient sera at 600 nm for reactivities of the recombinant Tp0453, Tp92, and Gpd proteins are shown on the y axis. The x axis displays the value for the VDRL test, shown as the reciprocal of the highest dilution tested that gave reactivity in the test. The four values at 0 along the x axis were nonreactive or of equivocal reactivity in the VDRL test with undiluted sera of individuals with early primary syphilis.