🧵🧵Australian church choir singer #covid19 outbreak now in CDC EID
———
•no masks
•no ventilation systems
•transmission >50 feet—> airborne
•confirmed via genome sequencing
•12 secondary cases detected out of 508 (2.4%), although only 434 were tested
Source: CDC EID journal
———
•no masks
•no ventilation systems
•transmission >50 feet—> airborne
•confirmed via genome sequencing
•12 secondary cases detected out of 508 (2.4%), although only 434 were tested
Source: CDC EID journal
2/ So the index case was a choir singer who started to feel sick on July 16th; sang at four 1 hour services on the 16th & 17th from a choir loft elevated 11.5 feet above the congregation #covid19
3/ The secondary cases reported no other contact with the singer.
Video recordings were also used to confirm their seating positions relative to the index case as well. #covid19
Video recordings were also used to confirm their seating positions relative to the index case as well. #covid19
4/ Ventilation was assessed- seems like it wasn’t very good.
Ironically this was right around the time in late July when @zeynep piece in @TheAtlantic came out on the same topic— “why aren’t we talking more about ventilation?”
Ironically this was right around the time in late July when @zeynep piece in @TheAtlantic came out on the same topic— “why aren’t we talking more about ventilation?”
5/ Interesting that there were no cases reported that only attended the July 17th session.
Also, the secondary attack rate is still somewhat low at 2.4% across 4 events (5.8% at one of the 4) — other choir singing-type events have had much higher
Also, the secondary attack rate is still somewhat low at 2.4% across 4 events (5.8% at one of the 4) — other choir singing-type events have had much higher
6/ Many factors go into this though
85% had follow up for at least one test within 17 days after exposure
Still- as we know- without serial testing, you are bound to miss some cases that then are marked as “negative”
Also- would suspect the actual size of indoor space matters
85% had follow up for at least one test within 17 days after exposure
Still- as we know- without serial testing, you are bound to miss some cases that then are marked as “negative”
Also- would suspect the actual size of indoor space matters
6.5/ Being in a small room w/ an infected choir singer v being spread out in a large hall with one singing from a loft is going to pose a different level of risk— would also expect this reflected in diff transmission dynamics/ number secondary cases etc #covid19
7/ I think this study does add more important evidence—> airborne transmission of #covid19 can & does occur, esp under the “right” circumstances- poor ventilation indoors w/ an infectious case where masks are not worn (& singing here, but aerosolize even just talking)
8/ So, important to remember again that there are no magic “6 foot” rules with this
The further away you are from someone else, the better
Better ventilation
Shorter duration of time when possible
Masks (esp if unvaccinated in public settings) #covid19
The further away you are from someone else, the better
Better ventilation
Shorter duration of time when possible
Masks (esp if unvaccinated in public settings) #covid19
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