What Happened
- A peer-reviewed study published in the journal Science (April 2026) found that wild mammals involved in trade have a 50% higher probability of sharing at least one pathogen (virus, bacterium, fungus, or parasite) with humans compared to non-traded species.
- Researchers assessed 2,079 traded mammal species: 41% shared at least one pathogen with humans, versus only 6.4% of non-traded mammals — a dramatic divergence.
- The study, led by researchers from the University of Lausanne in collaboration with Yale University, the University of Maryland, and the University of Idaho, analysed 40 years of data on wildlife trade and disease spillover.
- Risk is further elevated when animals are traded illegally or kept alive (as exotic pets), and each decade a species is present in trade adds on average one additional shared pathogen.
- The findings highlight wildlife trade — both legal and illegal — as a key driver of future pandemic risk and call for stronger international regulation.
Static Topic Bridges
Zoonotic Diseases and the Human-Wildlife Interface
Zoonotic diseases are infections that can be transmitted between animals and humans (spillover). They account for approximately 60% of all known human infectious diseases and 75% of emerging infectious diseases. Major historical zoonotic outbreaks include the SARS epidemic (2002–2004, civets/bats), H5N1 avian influenza, MERS-CoV (camels), Ebola (bats/non-human primates), Nipah (bats), and COVID-19 (widely linked to wildlife markets). The "One Health" framework — endorsed by WHO, FAO, UNEP, and the World Organisation for Animal Health (WOAH) — recognises that human health, animal health, and ecosystem health are inextricably linked.
- ~60% of known human infectious diseases are zoonotic in origin
- ~75% of emerging infectious diseases originate from animals
- Key spillover settings: wildlife markets (live-animal trade), bushmeat hunting, habitat encroachment
- One Health framework: integrated approach addressing human-animal-environment health nexus
- COVID-19 origins debate brought global attention to wildlife markets as disease amplifiers
Connection to this news: The study quantifies the elevated spillover risk from traded mammals, directly validating the One Health concern that wildlife trade is a systemic driver of zoonotic outbreaks.
International Wildlife Trade Regulation — CITES
The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) is the primary international treaty governing wildlife trade, with 183 signatory parties. CITES operates through three Appendices: Appendix I bans commercial trade in the most endangered species; Appendix II regulates trade in species that could become threatened; Appendix III covers species protected in at least one country. India enacted the Wildlife (Protection) Act, 1972 (amended in 2022) to implement CITES obligations domestically and regulate internal wildlife trade. The 2022 amendment added provisions specifically targeting digital/online wildlife trade and organised wildlife crime networks.
- CITES established: 1975; 183 signatories
- Appendix I: Strictest protection — commercial trade prohibited (e.g., tigers, elephants)
- Appendix II: Trade permitted with export permits and sustainability checks
- Appendix III: Bilateral protection listings
- India: Wildlife (Protection) Act 1972, amended 2022 — implements CITES domestically
- Illegal wildlife trade is estimated to be the 4th largest illegal trade globally (after drugs, weapons, and human trafficking)
Connection to this news: The study's finding that illegal trade and live-animal trade carry the highest zoonotic risk directly supports calls for stricter CITES enforcement and closure of live-animal wet markets.
Pandemic Preparedness — Policy Implications
The study's findings arrive in the context of ongoing negotiations for a global Pandemic Treaty under the WHO's Intergovernmental Negotiating Body (INB). The draft treaty includes provisions on One Health implementation, wildlife trade regulation, and zoonotic disease surveillance. India is a participant in these negotiations. At the national level, India's National Action Plan for Antimicrobial Resistance (NAP-AMR) and the Integrated Disease Surveillance Programme (IDSP) are the primary mechanisms for monitoring zoonotic spillovers at the human-animal interface.
- WHO Pandemic Treaty: under negotiation as of 2026; includes wildlife trade and One Health provisions
- IDSP (Integrated Disease Surveillance Programme): India's epidemiological surveillance network
- National Institute of Virology (NIV), Pune: primary body for zoonotic pathogen research in India
- The study recommends: stricter regulation of live-animal markets, enhanced surveillance of traded species, and international enforcement of trade bans
Connection to this news: The study provides the strongest quantitative evidence yet for including wildlife trade restrictions in the global Pandemic Treaty currently under negotiation, making it directly relevant to India's international health governance stance.
Key Facts & Data
- Traded mammals sharing pathogens with humans: 41% (vs. 6.4% of non-traded mammals)
- Zoonotic risk increase from wildlife trade: 50% higher probability of human-animal pathogen sharing
- Each decade in trade: adds ~1 additional shared pathogen per species
- Species assessed: 2,079 traded mammal species
- Study published: Science journal, April 2026
- Study led by: University of Lausanne (with Yale, UMd, U of Idaho)
- CITES Appendix I species: commercial trade fully prohibited
- Wildlife Protection Act 1972 (amended 2022): India's domestic legal framework
- Illegal wildlife trade: estimated 4th largest illegal trade globally