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Netherlands. June.
Almost no entire ward of patients in a retirement home was infected.

Despite wearing face masks continuously except for lunch breaks, 18 staff members were also infected.
When a newly installed air-ventilation system was inspected, the health authorities found large quantities of the virus on the mesh covering air intake and extraction units and in its filters.

No other explanation other than aerosol spread.

This is pretty damn important.
Almost *an* entire ward infected, dammit.
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