Thread by @jhengstler

@prof_nch (1/?) Profs thinking it’s ok to exercise privilege & unmask to teach in indoor classroom of students who must attend or possibly fail class—either have COMPLETELY NO understanding that 1)#aerosol is main transmission route for #COVID19; 2) how aerosol transmission actually works;

@prof_nch (2/?) 3) #Delta is hypertransmissible with rate of 1 infecting on avg 5-7 more vs earlier strains 2-3 more; 4) most infected don’t know they’re infected when they are at their most infectious because symptoms only show after peak infectiousness—if ppl not asymptomatic; …

@prof_nch (3/?) most have no real functional understanding of indoor air quality in own classrooms & rely solely on air system filtration—don’t monitor it with CO2 meters, keep windows/doors open; 4) don’t think about minimal acceptable air quality vs ‘good/excellent’ by #ASHRAE standard;

@prof_nch (4/?) 4) vaccines confer systemic but not sterilizing immunity—which means vaccinated do still catch & spread #COVID19 ( but less likely hospitalizations/deaths); 5) cloth & surgical masks worn by most students (& faculty) are ~1/6th the protection of #KN95 or #N95 masks;

@prof_nch (5/?) So either they lack that knowledge👆 —-OR they have a misguided sense of complacent exceptionalism that THEY won’t be infected—or that they could surely recognize when they’re infectious (see point 4 in 2nd tweet —not possible) —-OR don’t believe in #COVID19 —

@prof_nch (6/?) OR in the worst of all scenarios-where there is no true MEDICAL exemption to go unmasked to teach/present—but unmasked by choice—they know all the mentioned risks & choose to place their convenience above student safety in classrooms.

@prof_nch (7/?) I would suggest those encountering faculty choosing to assert an unmasking privilege in indoor classrooms share 2 articles: 1st) @elpaisinenglish ’s excellent Oct 2020article english.elpais.com/society/2020-1… 2) #uS @CDCgov ’s case study cdc.gov/mmwr/volumes/7…

@prof_nch @elpaisinenglish @CDCgov (8/?) And if the main concern among the faculty choosing to unmask is voice strain from teaching while masked-suggest a reasonably priced wireless mic system like this #Synco one amazon.ca/dp/B08HZ8YF9W/…

@prof_nch @elpaisinenglish @CDCgov (9/?) depending on classroom configurations a wireless mic could work with already built-in classroom speakers or a portable speaker. Am working with some colleagues & tinkering with #Synco set ups currently

@prof_nch @elpaisinenglish @CDCgov (10/?) A wireless system with a PERSONAL lapel/lavalier clip-on mic is preferable I find—personal for #COVID19 hygiene reasons as it can attach right on a #KN95 or near masked mouth/face area & you can avoid disinfecting units if each user has own detachable lapel mic

@prof_nch @elpaisinenglish @CDCgov (11/?) I think you could share a #Synco pack between a few profs with their own lapel/lavalier mics—but #Synco also has a 2 mic/1 receiver system for team teaching/presenting scenarios

@prof_nch @elpaisinenglish @CDCgov (12/?) And for the record, I have not received any free merch or $ or discounts from #Synco & am not involved with #Synco other than consumer/user.