Airborne viruses recycled through a low-grade ventilation system likely created Germany’s first super-spreader event of the Covid-19 pandemic, a CSI-style analysis of a carnival celebration has found.

The event at the town hall of Gangelt, a municipality on the border with the Netherlands, was labelled “Germany’s Wuhan” after it was found to be the driver of a major outbreak in the western state of North-Rhine Westphalia last year.

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