SouthernWorldwide.com – A groundbreaking new study has unveiled a significant revision to the historical timeline of leprosy’s presence in the Americas, suggesting the disease was endemic long before the arrival of European explorers.
Scientists have identified a second species of bacteria responsible for leprosy, also known as Hansen’s disease, in the Americas. This discovery challenges long-held beliefs about the disease’s origins and transmission on the continents.
Historically, the bacterium Mycobacterium leprae was widely believed to be the sole cause of leprosy in the Americas. The prevailing theory attributed its introduction to early European explorers and settlers.
However, the identification of this second bacterial species, Mycobacterium lepromatosis, fundamentally alters this narrative. It indicates that a strain of the disease was already present and circulating among Indigenous populations for centuries.
The study, published by researchers from the Institut Pasteur in Paris, France, in collaboration with a U.S. university, reveals that Mycobacterium lepromatosis had been infecting humans for approximately 1,000 years before Europeans set foot on the continents.
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Dr. Maria Lopopolo, the study’s first author and a researcher at the Institut Pasteur’s Laboratory of Microbial Paleogenomics, emphasized the transformative impact of this finding. She stated that it completely reshapes the understanding of leprosy’s history in the Americas.
“This discovery transforms our understanding of the history of leprosy in America. It shows that a form of the disease was already endemic among Indigenous populations well before the Europeans arrived,” she explained in a press release.
The research initiative commenced after Mycobacterium lepromatosis was identified in a Mexican patient in 2008. Further investigation in 2016 linked the bacterium to red squirrels in the British Isles.
Employing advanced genetic techniques, scientists were able to reconstruct the genomes of Mycobacterium lepromatosis from ancient individuals in Argentina and Canada. The genetic analysis revealed a close relationship between the strains from these disparate regions within the Mycobacterium genome family tree.
This genetic proximity strongly suggests that the bacteria had spread rapidly and extensively throughout the American continents. The study’s findings confirm that Mycobacterium lepromatosis had already established a significant presence across both North and South America.
The research involved extensive collaboration with Indigenous communities, various international institutions, and archaeologists. This collaborative effort allowed scientists to analyze over 800 DNA samples sourced from ancient human remains and more recent medical cases exhibiting leprosy symptoms.
Nicolás Rascovan, the lead author of the study from the Institut Pasteur, highlighted the research’s ability to reshape our perception of human history. He noted that this discovery is just the beginning of understanding the diversity and global spread of this recently identified pathogen.
“We are just beginning to uncover the diversity and global movements of this recently identified pathogen,” he stated. “This study allows us to hypothesize that there might be unknown animal reservoirs.”
According to the Centers for Disease Control and Prevention (CDC), leprosy is a chronic infectious disease that primarily affects the nerves, skin, and eyes. It is treatable with antibiotics.
The CDC reports that approximately 225 people in the United States contract Hansen’s disease annually, with global figures reaching around 250,000 cases each year.
