Bedside Tests for Syphilis and Yaws Tested in Sub-Saharan Africa (image) PLOS Share Print E-Mail Caption This is one of the study authors, Hilary Toloka, demonstrating how to do the test. Credit Marks et al. (2018) Usage Restrictions CC BY 4.0 Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.