Shared Indoor Environments News Today

Should our columnist keep his mask on when he MCs a long-delayed celebration? The numbers suggest that he – and all the guests – should.

As readers know, I have long urged, following the science, that Covid is airborne, and that its main mode of transmission is via aerosols. (I was initially persuaded by an epidemiological study, now consigned to link rot, that showed a seat diagram on a Chinese bus with the index case and how many were infected. It seemed clear that neither fomites nor hacked up droplets could be the cause, since the seats were widely separated. Many more such studies followed. No such studies followed for fomi...