Vietnam Skeletons Reveal Mother‑to‑Child Transmission of Yaws, Rewriting Syphilis History

Recent analysis of 3,500‑year‑old skeletons from Vietnam has uncovered evidence that yaws—a treponemal disease closely related to syphilis—was transmitted from mother to child. The pattern of congenital infection, long used by researchers to infer the presence of syphilis in ancient populations, now appears to be a hallmark of yaws instead. This discovery challenges the prevailing assumption that congenital transmission in archaeological remains necessarily signals syphilis, prompting a re‑examination of how scientists identify ancient treponemal infections. By complicating the diagnostic criteria, the find may shift prevailing theories about the geographic and temporal origins of syphilis, a disease whose history has been debated for centuries. The study underscores the importance of distinguishing between related pathogens in the fossil record and highlights the need for more nuanced approaches to interpreting ancient disease markers.