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View all search resultsWhen an invisible hazard crosses national borders
Unlike seasonal smoke, the next cross-border hazard won't announce itself in the sky—it will quietly arrive on the workplace floor.
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Anti-contagion bastion: The bright facade of the Sulianti Saroso Infectious Disease Hospital stands out on May 12, 2026 in Tanjung Priok, North Jakarta. (AFP/Bay Ismoyo)
S
outheast Asia has learned, sometimes painfully, that borders cannot contain everything. Smoke drifts across them. People and goods cross them daily. Animals move along trade routes, through farms and bustling wet markets. And sometimes, diseases move with them.
We are already deeply familiar with transboundary haze. When smoke blankets the horizon, we can see it, smell it, and measure its impact in real time. Governments respond, neighbors voice concern, and regional bilateral mechanisms are activated. The hazard is tangible, even if its origin lies across the sea or across the border.
Biological hazards, however, are far more elusive. They cross the very same borders without leaving a trace in the air.
A pathogen can hitch a ride with livestock. A rodent can nest inside a cargo shipment. A mosquito can hitchhike aboard a truck or an aircraft. A worker can fall ill without ever holding a passport or leaving their home district. By the time an illness is finally diagnosed, identifying the initial point of entry can prove nearly impossible.
Southeast Asia has walked this path before.
The history of Nipah virus remains one of our region’s starkest reminders. First identified during the 1998 outbreak among pig farmers in Malaysia, it crossed into Singapore in 1999 through imported livestock. The episode brought home an uncomfortable reality: an infection emerging at the human-animal interface can swiftly become a cross-border crisis when animals and people move through interconnected supply chains.
Nearly three decades later, that lesson has only grown more urgent. Our region is more connected than ever.
