Association of circulating Treg numbers with serum RPR titers in primary, secondary, latent and serofast syphilis patients.

<p>Serum RPR titers are plotted against circulating CD4⁺ CD25^high Treg frequencies in primary (<b>A</b>, n = 64), secondary (<b>B</b>, n = 96), latent (<b>C</b>, n = 86) and serofast (<b>D</b>, n = 43) syphilis patients. Each dot represents an individual patient. The straight line in each graph is the result of linear regression analysis. Pearson's correlation coefficients (r) and P values are shown.