1/ "To prevent the virus from spreading, companies that needed employees to return to in-person work put up plexiglass barriers, implemented daily temperature checks and required workers to wear masks while in proximity to others." What's wrong with this picture? https://twitter.com/HuffmanLabDU/status/1342336300611903491

2/ Plexiglas barriers are not very effective at reducing transmission by aerosol particles. Temperature checks do not catch pre-symptomatic, asymptomatic, or symptomatic infectors w/o fever. Masks "while in proximity of others" = unacceptable. Masks at all times indoors.

3/ And we wonder why there are outbreaks in the workplace. LRRS = Layered Risk Reduction Strategy, not LRR Shortcut. LRRS must be done based on layered interventions that make scientific sense. Performance = sad. Almost a year in, folks. What will it take to get this right?

4/ Workplace. Universal mask wearing for everyone (only way to assure an asymptomatic infector is wearing a mask). Physical distancing. Increased ventilation (aim for 2x ASHRAE 62.1-2019 or more if possible). Improved filtration (to MERV-13 if possible) and/or UVGI. Just do it!

5/ Portable HEPA air cleaners w/ appropriate clean air delivery rate (CADR) (e.g., 300 cfm) in appropriate spaces, e.g., < 1,000 ft2 w/ ceiling height < 10 ft. Staggered work hours to de-densify where possible. etc. Just do it!