Seems we have fundamentally unlearned what we once knew.

This is SUCH a no-brainer, application beyond SARS2, future proofing, reduced healthcare burden...
Of course, to take action is to acknowledge the problem...🙄
cam.ac.uk/research/news/…

Stephen Griffin Karin Saelig 💙 I used this article to persuade my dental surgery to switch their HEPA filters back on. They had them, but recently decided they were “no longer necessary”😶