Scarlet Fever and Strep Throat Existed in Pre-Hispanic Americas

A new analysis of a 700-year-old pre-Hispanic mummy from Bolivia has provided the earliest confirmed evidence of the bacterium that causes strep throat and scarlet fever in the Americas, predating European colonization by several centuries. The discovery, reported in a recent study, indicates that Streptococcus pyogenes, a pathogen responsible for a range of infections from mild sore throats to life-threatening conditions, was already present in Indigenous populations long before contact with Europeans.

The research team, led by scientists examining ancient microbial DNA, extracted and sequenced genetic material from the mummified remains of a child estimated to have lived between the 13th and 15th centuries. Using advanced paleogenomic techniques, they identified traces of S. Pyogenes DNA in tissue samples, confirming the bacterium’s presence in the individual during life. This finding marks the first definitive molecular evidence of the pathogen in the pre-Columbian Americas.

Understanding the Significance of the Discovery

Historically, the origins and spread of S. Pyogenes have been difficult to trace due to the bacterium’s lack of a durable fossil record and the challenges of detecting ancient pathogens in degraded biological samples. Prior to this study, the earliest confirmed cases of strep-related infections in the Americas were linked to colonial-era remains, leading some researchers to hypothesize that the bacterium may have been introduced by Europeans. However, this new evidence challenges that assumption, suggesting that S. Pyogenes was already circulating among Indigenous populations in the Andes well before 1492.

The presence of the bacterium in a pre-Hispanic context raises important questions about the diversity and evolution of streptococcal strains in the Americas. While S. Pyogenes is now a global pathogen with numerous subtypes, its ancient lineage in South America may represent a distinct evolutionary branch that either died out or was later replaced by strains introduced during colonization. Further genomic comparison with both ancient and modern strains could help clarify the pathogen’s migration patterns and adaptation over time.

Health Implications and Modern Relevance

Although S. Pyogenes commonly causes mild illnesses such as pharyngitis (strep throat) and impetigo, it can also lead to severe complications including rheumatic fever, post-streptococcal glomerulonephritis, and invasive infections like necrotizing fasciitis and streptococcal toxic shock syndrome. In regions with limited access to antibiotics and healthcare, these complications remain a significant cause of morbidity and mortality, particularly among children.

The discovery does not imply that ancient populations suffered epidemics on the scale seen in later historical outbreaks, but it does confirm that the biological potential for such infections existed long before European contact. Understanding the deep history of human-pathogen interactions can inform modern efforts to anticipate how bacteria evolve, spread, and respond to environmental and societal changes.

Limitations and Future Research Directions

The researchers caution that while the DNA evidence is strong, it represents a single case from one individual and one geographic location. As such, it cannot yet determine how widespread S. Pyogenes was across pre-Columbian populations or whether it caused noticeable illness in the mummified child. The presence of bacterial DNA does not always equate to active disease, especially in asymptomatic carriers, though the strain detected is known to be virulent in modern contexts.

Future studies aim to screen additional ancient remains from various regions across the Americas to map the historical distribution and diversity of S. Pyogenes. Scientists also hope to compare these ancient genomes with contemporary strains to identify genetic changes associated with virulence, antibiotic resistance, or host adaptation. Such research could contribute to broader efforts in molecular paleopathology and infectious disease evolution.

As techniques for detecting ancient pathogens continue to improve, discoveries like this one are reshaping our understanding of the deep history of human disease. Rather than viewing epidemics solely as consequences of colonial contact, scientists are now recognizing a more complex narrative in which many pathogens were already part of the human experience long before transoceanic travel connected the continents.