NEW DELHI: In January 2026 a Nipah virus case was confirmed in West Bengal. The fruit bat had done what it does every wet season in South Asia shed virus into half-eaten mangoes and date palm sap. A human consumed what the bat had left behind. The case fatality rate for Nipah in Indian clusters runs as high as 90%. The outbreak was contained. However it was not the first time. Kerala has recorded Nipah outbreaks in 2018, 2019, 2021, 2023 and again in early 2026. The pattern is not coincidence it is consequence.
Animal-borne diseases zoonoses now define the frontier of global health security. Furthermore the data shows this threat is accelerating, not stabilising.
The Scale of What We Are Facing
The numbers establish the baseline clearly. More than 60% of known infectious diseases in humans are zoonotic. Up to 75% of all emerging infectious diseases reported globally originate in animals wild and domestic. Additionally the annual frequency of high-consequence spillover events has been increasing at approximately 4.98% per year over the last five decades, while reported deaths from these events have risen by 8.7% annually.
On a yearly basis zoonotic diseases cause an estimated 2.5 billion cases of human illness and approximately 2.7 million deaths worldwide. The economic cost is equally staggering WHO estimates the annual global economic burden of zoonotic outbreaks at approximately $6 Trillion. COVID-19 alone is projected to reduce global GDP by $22 trillion by 2025.
Consequently these are not isolated events. They are a systemic pattern driven by the same set of human choices repeating across different geographies and different species.
Why the Risk Is Rising: Five Converging Drivers
Deforestation is the single largest driver of zoonotic disease emergence accounting for 31% of reported events. When forests are cleared, species like bats and rodents are compressed into smaller habitat patches adjacent to human settlements. A diverse forest dilutes pathogen prevalence across many species. A fragmented forest concentrates it in the species most efficient at transmitting virus to humans. Studies of Ebola outbreaks consistently show that spillover risk peaks at the edges of fragmented forests where human activity is most intense.
Industrial livestock farming accounts for 23% of zoonotic disease emergence. Thousands of genetically similar animals kept in high-density conditions create evolutionary accelerators environments where pathogens like avian influenza mutate rapidly and find bridge hosts that carry the virus from wildlife to human handlers.
Global wildlife trade contributes to 26% of zoonotic outbreaks. Live animal markets bring diverse species together under stress in unhygienic conditions facilitating the cross-species viral exchange that precedes most spillover events. Meanwhile global air travel means that once a human infection begins a local outbreak can become a global pandemic within 24 hours.
Climate change is responsible for approximately 17% of zoonotic emergence. The 2025 Lancet Countdown report found that climate suitability for dengue transmission by Aedes mosquitoes has increased by up to 49% since the 1950s. As species migrate to higher altitudes and latitudes under warming conditions previously isolated wildlife come into contact with new hosts and new human populations.
Antimicrobial resistance compounds everything. Overuse of antibiotics in livestock and human medicine has produced drug-resistant strains of zoonotic bacteria making common infections like brucellosis and salmonellosis significantly more dangerous and harder to treat.
India at the Centre: Why This Country Is Especially Vulnerable
India is recognised as one of the most significant global hotspots for zoonotic spillover. Three structural factors converge to make that designation accurate.
India has the largest livestock population in the world over 537 million animals as of 2024-2026, contributing 30.23% to agricultural GVA. These animals live within or adjacent to human households across the country. This creates a continuous biological interface where transmission risk is not a seasonal event but a daily condition.
India accounts for 36% of global rabies deaths. WHO estimates 18,000 to 20,000 deaths annually from rabies in India alone. The country records 3.7 million dog bites per year. Moreover the government’s own surveillance data recorded only 54 deaths in 2024 a gap so wide it reflects not a disease controlled but a disease uncounted. Between 2022 and 2026 over 250,000 scrub typhus cases were reported nationally, driven by mite-infected rural agricultural communities. Kyasanur Forest Disease monkey fever recorded its first death of the 2026 transmission season in Karnataka in January approximately four weeks earlier than the typical seasonal baseline, reflecting accelerating tick activity linked to environmental change.
Kerala and the Western Ghats represent India’s most acute spillover frontier. High population density, forest encroachment, and the presence of Pteropus fruit bats the primary Nipah reservoir create recurring conditions for outbreak. Nipah carries a fatality rate of up to 90% in Indian clusters significantly higher than in Malaysia or Bangladesh. Furthermore Nipah virus antibodies have been confirmed in bat populations in Assam and Meghalaya indicating the risk extends far beyond Kerala’s reported outbreak geography.
India’s massive poultry sector remains highly exposed to H5N1 avian influenza through wild bird migration corridors. As of May 2026 H5N1 has not achieved sustained human-to-human transmission however the virus has now spread into dairy cattle in the United States and domestic cats in Los Angeles, demonstrating an evolving affinity for mammalian hosts that scientists consider deeply concerning.
The Diseases to Watch
H5N1 bird flu is the pathogen that keeps epidemiologists awake. Scientists at UNMC warned in January 2026 that the virus is “completely out of control” in bird populations. India’s backyard poultry farming often conducted without personal protective equipment represents a significant rural exposure risk should the virus acquire efficient human transmission.
Nipah virus sits at the extreme end of lethality. Its spillover mechanism is specific fruit or date palm sap contaminated with Pteropus bat saliva or urine. Its fatality rate in Indian clusters approaches 90%. There is no approved vaccine. Containment depends entirely on early detection and isolation both areas where India’s surveillance system has documented gaps.
COVID-19 shifted the conversation permanently. As of March 2026 SARS-CoV-2 has been detected in 68 animal species across 49 countries. White-tailed deer and farmed mink now sustain transmission and potential viral evolution independently of human populations. The virus that began in an animal market in Wuhan has effectively re-entered the animal kingdom at scale.
Scientists estimate the annual probability of a pandemic similar in scale to COVID-19 at approximately 2%. Over a lifetime that translates to a 38% chance of experiencing another major pandemic. Furthermore the IPBES 2026 report concludes that biodiversity loss creates systemic economic risk and that it is currently more profitable to degrade biodiversity than protect it, creating what the report calls a twisted reality that directly fuels pandemic risk.
India’s Policy Response And Its Gaps
India has launched a National One Health Mission, established the National Institute for One Health in Nagpur and conducted pandemic mock drills including Vishanu Yudh Abhyas and Viral Sankraman Abhyas in 2024 and 2025. However those drills identified critical gaps insufficient BSL-3 laboratory capacity and fragmented coordination between health, animal husbandry and environment ministries.
Rabies is not a notifiable disease in all Indian states. Zoonotic surveillance data therefore flows inconsistently from state to centre. Additionally the three ministries most relevant to zoonotic risk health, animal husbandry and environment continue to operate in programmatic silos rather than as an integrated early warning system.
WHO Director-General Dr Tedros Adhanom Ghebreyesus stated on February 2 2026 “The pandemic taught all of us many lessons especially that global threats demand a global response. Investing in preparedness is an investment in lives saved and economies protected.”
India’s public health experts and the One Health Joint Plan of Action 2022-2026 both converge on the same prescription a digitally enabled integrated surveillance network that ensures a sick animal in a remote village triggers an immediate public health response. That network does not yet exist at the scale the risk demands.
The Bottom Line
The next zoonotic pandemic will not announce itself. It will begin as COVID-19 did, as Nipah does every year, as H5N1 is doing right now in cattle and cats at the edge of a forest, in a live animal market, on a backyard farm where a migratory bird lands beside domestic poultry.
India sits at the intersection of every risk factor that drives zoonotic emergence. It has the livestock density, the forest encroachment, the bat populations, the climate vulnerability and the surveillance gaps to make that intersection genuinely dangerous. Therefore what India does with its One Health architecture in the next three years will determine not just its own pandemic preparedness but a significant share of the world’s.
About the Author
