Archive · 5 Jun 2025
Leprosy in Americas Pre-Colonization: A New Discovery
Scientists discovered that a type of leprosy was present in the Americas long before Europeans arrived.
They found evidence of a specific bacteria, Mycobacterium lepromatosis, infecting people in the Americas for at least a thousand years.
This suggests that leprosy was already affecting indigenous populations before the arrival of Europeans.
The Europeans then brought their own type of leprosy bacteria, called Mycobacterium leprae, which added to the existing health challenges.
The research helps us understand the spread of diseases and how they've affected people throughout history.
Today, leprosy can be treated, but it still affects many people around the world.
A study found a leprosy-causing bacteria, Mycobacterium lepromatosis, existed in the Americas before European arrival.
This form of leprosy circulated for at least a thousand years prior to European colonization.
Europeans introduced a different leprosy-causing bacteria, Mycobacterium leprae, to the Americas.
The study analyzed ancient remains from Canada and Argentina to trace the bacteria's spread.
The discovery highlights the complex history of pathogens and their impact on human populations.
- Who
- Scientists
- What
- Discovery of Mycobacterium lepromatosis in the Americas prior to European arrival.
- When
- At least 1,000 years before European colonization
- Where
- Americas (Canada and Argentina)
- Why
- To understand the history and diversity of leprosy-causing bacteria, and to track the disease.
Disease Impact
Historical Context
Origin of Leprosy in Americas
Disease Impact
Study reveals a leprosy-causing bacteria (Mycobacterium lepromatosis) existed in the Americas for at least 1,000 years before European colonization.
Historical Context
Europeans introduced a new form of leprosy (Mycobacterium leprae) to the Americas, intensifying the impact of existing pathogens.
- Leprosy Species in Americas Pre-Colonization
- Mycobacterium lepromatosis
- Annual Global Leprosy Cases
- 200,000
- Earliest Skeletal Record of Leprosy
- 2000 BCE
- Countries with >10,000 Annual Cases
- Brazil, India, Indonesia
- European Arrival in Americas
- 1492
- Leprosy Bacteria Species Introduced by Europeans
- Mycobacterium leprae