CDC's 'huge mistake': did misguided mask advice drive up Covid death toll for health workers?

Researchers say very low'-quality research led to outdated guidelines on who got the best PPE, leaving those most at risk exposed

• Lost on the frontline: the healthcare workers who died of Covid

Since the start of the pandemic, the most terrifying task in healthcare was thought to be when a doctor put a breathing tube down the trachea of a critically ill Covid patient.