Sr writer, infectious diseases @statnews. 2020 Polk Award winner. Niemen '11. Conspiracy theory free zone; I block rude, racist. She/her #Covid #Ebola #flu 🇨🇦
Pretty interesting report of #Covid19 transmission during church services in Australia. Infected choir member appears to have transmitted to up to 12 church goers, some seated more than 15 meters from the choir loft. No masks. Yes, likely airborne. wwwnc.cdc.gov/eid/article/27…pic.twitter.com/Wmi6jxOPox
Very TB-like story here.
Small comment: all secondary cases "max of 2SNPs from.. primary case-patient"; that seems a little high for the time period, tho not impossible..Would help to see genomic context from community (or know if there weren't any other cases around the time) twitter.com/HelenBranswell…
This is a great example of the situational airborne transmission @CDCgov discusses - prolonged period of time, no masks, minimal ventilation, and singing. Also - “Five of the secondary case-patients were from the same households as earlier cluster case-patients.“ twitter.com/HelenBranswell…
Also interesting to see no transmission from those who attended on just 7.17. This is also a good reminder of staying home when you’re not feeling well. The index case “reported symptom onset of malaise and headache on July 16 and cough and fever on July 17”
Remarkable outbreak investigation.
Indoor, unmasked gatherings, especially with singing/chanting/shouting, risks transmission.
[Disclosure: I co-signed an amicus brief in support of California Governor Gavin Newsom's public health protections in houses of worship] twitter.com/HelenBranswell…
My impression is that most professional and many amateur singers in the U.K. are painfully aware of the increased risk - related to volume not singing per se as @Voicedoctor_uk and colleagues demonstrated - and are taking appropriate steps to mitigate this. twitter.com/helenbranswell…
A singer at church infected 12 people. "Video recordings of the services showed that case-patients were seated in the same section, >15 m from the primary case-patient, without close physical contact, suggesting airborne transmission." twitter.com/Don_Milton/sta…
I don’t get it - were church goers intubating each other? Where is the aerosol generating procedure that explains this mystery? Are we absolutely sure it wasn’t the dirty doorhandles that caused this cluster? twitter.com/AntheaKatelari…
Professor, interested in plagues, pestilences and politics.
"One of the most dangerous Canadians"-- Ontario MPP (sic) Randy Hillier
Interesting that the index case in the Australia church outbreak was 18. @paulchenz has demonstrated that viral shedding is shorter in young people...that's likely why there was trans on symptom day -2 and -1, and not on 0...his VL was likely already down.wwwnc.cdc.gov/eid/article/27…
“We detected 12 secondary case-patients linked to an infectious case-patient at church services on 2 days. Secondary case-patients were seated in the same area of the church, >15 m from the primary case-patient, with whom there was no evidence of close physical contact.” twitter.com/DFisman/status…pic.twitter.com/MSgbI9hyPY
“We believe that transmission during this outbreak is best explained by airborne spread, potentially the result of by 3 factors.”
2. Poor ventilation
3. Peak infectiousness of index case confirmed with measures of viral load.
“Although we cannot completely exclude fomite transmission, this transmission would not explain the spatial clustering of case-patients within the church over 2 days.”
This is from a transmission event one year ago.
Prof at @HarvardChanSPH; Commissioner + Chair Task Force on Safe Work/School/Travel for The Lancet COVID19 Commission. Coauthor of "Healthy Buildings" (HUP)
Add it to the list - choir, spin class, gym, hockey locker room, restaurant, bus...
Same factors, every time:
--> no masks
--> low/no ventilation
"the ventilation system at the apex was not in operation during the services."
“Video recordings showed that (the 12!) case-patients were seated >15 m from the primary case-patient, without close physical contact, suggesting airborne transmission”
- Airborne Transmission of SARS-CoV-2 during Singing wwwnc.cdc.gov/eid/article/27…
In this CDC EID epidemiology write-up of a Sydney Australia Church multi-day infection event, 12 people were infected 45 feet away from someone who was facing AWAY from them.
@pash22 @AntheaKatelaris @CDCgov Impossible to pin this exclusively on droplets and fomites, but according to the style of the latest @CebmOxford and @WHO sponsored systematic review, epidemiological evidence is inadmissible in the court of SARS-CoV-2 transmission. 😢
[we’ll just have to see about that...]