Kalshi markets are tracking the chance that the WHO will declare hantavirus a Public Health Emergency of International Concern this year, as a cluster of cases linked to a cruise ship has drawn attention from health officials around the world.
The market prices that chance at 22.9%.
How the infections began
Health officials traced the infections to a Dutch couple aboard a cruise ship. NPR reported that the couple may have contracted the virus on a bird-watching trip in a small town in southern Argentina before returning to the ship.
More than two dozen people from 12 different countries left the vessel before officials could conduct contact tracing. The cruise ship company Oceanwide Expeditions said none of the remaining passengers or crew members are showing any serious symptoms.
Tracking the virus
Health officials say the rare strain, which can spread from person to person, may have caused a limited cluster of cases across several countries.
The New York Times reported that the World Health Organization identified at least five people who displayed symptoms of the virus. The rare strain, known as the Andes strain, originates primarily from South America.
Additional people are being tested in other countries who may have had contact with passengers from the affected vessel. CBS News reported that two Americans in Georgia are being monitored after returning from the cruise ship.
Health officials are concerned the strain may have spread further since one of the cruise ship passengers boarded a plane following their trip. So far, there have been no new confirmed cases.
A reason for concern?
The Andes strain may spread differently from other hantavirus strains, but is considered a significant concern primarily when those infected are exposed for a prolonged period.
Hantavirus is typically transmitted through contact with, or inhalation of, particles from the feces, urine, and saliva of infected rodents. According to Bryce Warner, a research scientist at the Vaccine and Infectious Disease Organization at the University of Saskatchewan, it is also "exceedingly difficult" for this particular strain to spread between people.
Pandemic Risk
The broader picture supports a measured outlook. Kalshi's 2026 pandemic market, which tracks the chance of a new pandemic occurring this year, sits at 17%. Chances of a pandemic were at 19.7% exactly one month prior, suggesting the market does not currently view the hantavirus cluster alone as a significant driver of risk.
Economic implications
Aside from the human toll caused by the virus, a WHO emergency declaration can trigger trade and travel restrictions with significant economic consequences.
The stakes of a full pandemic declaration are considerably higher. COVID-19 caused global GDP to contract by 3.3% in 2020, and researchers estimate the total economic toll on the United States alone reached $14 trillion by the end of 2023.
The takeaway:
Kalshi markets now predict:
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