A recent discovery by researchers from the University of Salford in the UK and Brazil’s Federal University of Amazonas has revealed that wild monkeys in the Amazon are carrying a dangerous human disease, indicating a possible link to increased human encroachment into the rainforest.
The study identified human hepatitis B in blood and liver samples from 88 ‘new world’ primates across 28 different species. The presence of the virus in monkeys was concentrated in areas heavily affected by deforestation and urban expansion, particularly in Brazil’s Rondonia and Mato Grosso states, where a significant number of monkeys tested positive for hepatitis B virus (HBV), matching strains found in local human populations.
Conversely, in a remote area along the upper Japurá River in Amazonas state, none of the 39 sampled monkeys tested positive for HBV infection. This discrepancy highlights the correlation between human-wildlife proximity and disease transmission risks, underscoring the need for caution.
Hepatitis B is a severe liver disease that can lead to cirrhosis and cancer in humans. Its presence in wild primates in Central and South America raises critical questions regarding the origins and implications of the transmission.
Lead researcher Professor Jean Boubli emphasized the challenges in determining the exact transmission route of the virus. Potential factors include the pet trade, where young monkeys may be exposed to the infection before being released into the wild, and the increasing overlap between human settlements and forest habitats due to deforestation.
The study advocates for measures to mitigate deforestation and establish buffer zones between human settlements and natural habitats to minimize interactions that could facilitate disease transmission between species. The researchers stress the importance of monitoring the health impacts of HBV on infected primates and the potential risks associated with human consumption of these animals.
While the study does not suggest an imminent pandemic, it highlights how human activities are altering disease dynamics in the Amazon rainforest, underscoring the need for proactive measures to protect both wildlife and human populations.