Fig. 1

Positive syphilis status at delivery monthly prevalence proportions. Prepandemic observed monthly positive SSd rates used in forecasts are represented by black dots and connected with black lines with gray upper and lower 95% confidence intervals on the left panel. Holt-Winters seasonal monthly predictions (for the prepandemic period extending into the COVID- 19 pandemic period) are shown as lime green dots and connecting lime green lines with dark green upper and lower 95% confidence intervals. The observed monthly rates for the COVID- 19 pandemic period not used in the monthly forecasts are represented by blue circles and blue connecting lines with gray upper and lower 95% confidence intervals on the right panel