Cold and stale air conditions allowed coronavirus particles to travel more than 8 meters (26 feet) at a German slaughterhouse, a study showed, giving an insight into how meat plants turned into hotspots for infections across the world.

Researchers reconstructed the likely cause of the outbreak at a Toennies Group slaughterhouse in Rheda-Wiedenbrueck, where about 1,500 workers contracted the virus. Similar conditions at plants globally are a reason they’ve become virus epicenters, according to the report from groups including the Helmholtz Center for Infection Research.

Meat plants from the U.S. to the U.K. and South America have seen the rapid spread of the virus, infecting thousands of employees who often work in close proximity on processing lines. Dozens of workers have died, and labor advocates have said that a lack of social distancing could continue to put people at risk. Outbreaks also forced American meat plants to close earlier this year, sparking some protein shortages.

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