HEPA filters cut covid-19 sick days but we’ve been slow proving this


CARDIFF, WALES - FEBRUARY 23: A teacher wearing a face mask teaches a child at Roath Park Primary School on February 23, 2021 in Cardiff, Wales. Children aged three to seven began a phased return to school on Monday. Wales' education minister Kirsty Williams has said more primary school children will be able to return to face-to-face learning from March 15 if coronavirus cases continue to fall. (Photo by Matthew Horwood/Getty Images)

Matthew Horwood/Getty Images

TEMPERATURES have recently taken a dip in London, where I live, and, at home, I have been digging out my jumpers. At work, the winter feel is reinforced by a surge of interest in covid-19, with rising reported UK cases leading to familiar concerns over pressures on hospitals.

Because there is now much more population immunity to covid-19, it seems unlikely we would go back to restrictions on public mixing and so on. But in hospitals, where people are more vulnerable, there are questions over whether they should be reintroducing measures like staff wearing masks and having stricter isolation policies. …