The Impact of Global Wildlife Trade on Zoonotic Disease Spread

A recent study published in *Science* reveals that the global wildlife trade significantly contributes to the transmission of zoonotic diseases from animals to humans. Researchers analyzed over 40 years of international trade records and data from thousands of wild mammal species. They found that species involved in the wildlife trade were 50% more likely to carry pathogens that can infect humans compared to those not traded. Furthermore, the risk of sharing pathogens increased with the duration a species was part of the trade; for every ten years a species was traded, it shared an additional pathogen with humans.

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The study identified more than 2,000 traded mammal species, representing approximately a quarter of all mammal species globally. Notably, 41% of these traded species carried at least one pathogen known to infect humans, while only 6% of non-traded species shared any pathogens. The researchers emphasized that live animal markets and illegal wildlife trade exacerbate these risks, creating environments where pathogens can evolve and jump between species. Jérôme Gippet, an ecologist at the University of Fribourg and one of the study's authors, stated, “There’s no safe trade. As long as we continue trading species, we will expose ourselves to this problem.”

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The findings underscore the inherent risks associated with the wildlife trade, which encompasses the sale of live animals, animal products, and exotic pets. The study suggests that the trade not only facilitates the spread of existing pathogens but also creates opportunities for new zoonotic diseases to emerge. Colin Carlson, a global change biologist at Yale University and co-author of the study, noted that these markets act as "steppingstones" for viruses, allowing them to adapt to humans for the first time.

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While the study presents compelling evidence linking wildlife trade to increased disease risk, some experts call for more comprehensive data to fully understand the scale of the trade and its implications. Ann Linder, an associate director at Harvard Law School's animal law and policy program, highlighted the need for additional studies to quantify the risks associated with wildlife exploitation. She stated, “Wildlife, left alone in intact ecosystems, pose very little risk of spreading zoonotic disease to people,” emphasizing the importance of preserving natural habitats.

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The research highlights a critical public health concern regarding the global wildlife trade and its role in the emergence of zoonotic diseases. As the study indicates, the ongoing trade of wildlife poses significant risks to human health, necessitating urgent action to mitigate these dangers. Enhanced monitoring and stricter regulations on wildlife trade may be essential steps in reducing the likelihood of future disease outbreaks linked to animal pathogens.

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• “There’s no safe trade,” — Jérôme Gippet, Ecologist, University of Fribourg

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• “The more species are traded, the more opportunities they will have to transmit pathogens to humans,” — Jérôme Gippet, Ecologist, University of Fribourg

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• “What you get are steppingstones, where viruses are evolving in these markets,” — Colin Carlson, Global Change Biologist, Yale University

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• “The study’s authors demonstrate through data what we’ve long suspected to be true — that human use and exploitation of wildlife actually increases the risks of spillover,” — Ann Linder, Associate Director, Harvard Law School

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