Read on Twitter
Trying to capture recent articles on a few keys for #COVID19 spreading. Beginning of March, based on multiple cluster incidents, the medical expert panel for Japanese government identified three conditions for high transmission risk: (cont.)
1. Closed spaces with poor ventilation
2. Crowded spaces
3. Close-contact settings with conversations
Overlapping of three conditions are considered dangerous, and government and local officials have repeatedly instructed people to avoid these “three Cs”. https://twitter.com/jpn_pmo/status/1244231002257383424
2. Crowded spaces
3. Close-contact settings with conversations
Overlapping of three conditions are considered dangerous, and government and local officials have repeatedly instructed people to avoid these “three Cs”. https://twitter.com/jpn_pmo/status/1244231002257383424
Wikipedia has a good summary on Japan’s contact tracing effort.
https://en.wikipedia.org/wiki/COVID-19_pandemic_in_Japan#Contact_tracing_against_clusters
https://en.wikipedia.org/wiki/COVID-19_pandemic_in_Japan#Contact_tracing_against_clusters
This theory could explain why jam-packed commuter trains in Japan are, surprisingly, not a significant source of massive transmission. Because people remain silent (loud talking on a commuter train is a taboo in Japan), and the car is often ventilated well at every station.
I've just learned that "three Cs" is also used in Malaysia. I wonder if other East/South East Asian countries have similar notion to emphasize high-risk situation for COVID-19 transmission. https://www.malaymail.com/news/malaysia/2020/04/15/social-distancing-avoiding-three-cs-more-important-than-face-mask-heal/1857028
However, similar warnings have not been apparent in US media until recently. If we all keep 6ft/2m distance but keep talking in a poor-ventilated indoor space, is it still really safe?
Recently I’ve seen a couple of articles talking about observations similar to “three C” conditions.
@ErinBromage pointed out on his blog:
> All these infection events were indoors, with people closely-spaced, with lots of talking, singing, or yelling. https://www.erinbromage.com/post/the-risks-know-them-avoid-them
@ErinBromage pointed out on his blog:
> All these infection events were indoors, with people closely-spaced, with lots of talking, singing, or yelling. https://www.erinbromage.com/post/the-risks-know-them-avoid-them
BTW I was so glad to see this article that I instantly tweeted about it, because it pointed out the same concepts as “three Cs”. https://twitter.com/fujita_d_h/status/1259223601477279748
Article from @Bloomberg summarizing @ErinBromage’s blog (wow his blog got 11M views!) https://www.bloomberg.com/opinion/articles/2020-05-15/will-i-get-coronavirus-at-the-grocery-store-unlikely
Another famous thread from @DKThomp
> talking, laughing, singing in close quarters, in unventilated interiors, for many hours, is the perfect storm for a COVID super-spreader event. https://twitter.com/DKThomp/status/1260305939153985536?s=20
> talking, laughing, singing in close quarters, in unventilated interiors, for many hours, is the perfect storm for a COVID super-spreader event. https://twitter.com/DKThomp/status/1260305939153985536?s=20
@pete_wells / @NYTimes reports that just talking, not coughing or sneezing, is enough to emit droplets into the air which might contain viruses. https://twitter.com/pete_wells/status/1261140258768461831?s=20
With US and European countries heading toward reopening the economy, it is even more important that people understand the high-risk situations and avoid them. Hopefully this recent trend will positively impact people’s behavior going forward.
Just learned that NYC city council is now also aware of three Cs. https://twitter.com/MarkLevineNYC/status/1263479975157673985?s=19
And here's the recently-circulating Bloomberg @business 's article which mentions three C's explicitly. https://twitter.com/GearoidReidy/status/1264038262273748993?s=20
Also just learned that a cell biologist @RockefellerUniv tweeted very comprehensively on how Japan has been tackling #COVID19, including three Cs, on Mar 20-ish -- 2 months ago!. If I knew this thread I would not have started this thread. 
https://twitter.com/HironoriFunabi1/status/1241734715175993345?s=20
https://twitter.com/HironoriFunabi1/status/1241734715175993345?s=20
Recent article on @washingtonpost by @j_g_allen alarming the danger of poor-ventilated indoor space and super spreader events. https://www.washingtonpost.com/opinions/2020/05/26/key-stopping-covid-19-addressing-airborne-transmission/
Long anticipated paper by Japanese experts has finally appeared! Describes cluster tracing in Japan, "three Cs".
Clusters of Coronavirus Disease in Communities, Japan, January–April 2020
https://wwwnc.cdc.gov/eid/article/26/9/20-2272_article
Clusters of Coronavirus Disease in Communities, Japan, January–April 2020
https://wwwnc.cdc.gov/eid/article/26/9/20-2272_article
"We noted many COVID-19 clusters were associated with heavy breathing in close proximity, such as singing at karaoke parties, cheering at clubs, having conversations in bars, and exercising in gymnasiums. "
https://wwwnc.cdc.gov/eid/article/26/9/20-2272_article
https://wwwnc.cdc.gov/eid/article/26/9/20-2272_article
I'm excited to learn that an Austin-based TX state rep picked up this paper and introduced "three Cs" on her tweet. Hopefully this will have some good effect on TX public health policy. https://twitter.com/DonnaHowardTX/status/1271997425918640128?s=20
Another good thread on minimizing risks during re-opening economy, including three Cs-ish ideas bt @FT https://twitter.com/jburnmurdoch/status/1272596257417068544?s=20
WSJ summarizing three Cs. It should have noted that Japan has been telling people on this since March.
> Crowded events, poorly ventilated areas and places where people are talking loudly—or singing, in one famous case—maximize the risk. https://www.wsj.com/articles/how-exactly-do-you-catch-covid-19-there-is-a-growing-consensus-11592317650
> Crowded events, poorly ventilated areas and places where people are talking loudly—or singing, in one famous case—maximize the risk. https://www.wsj.com/articles/how-exactly-do-you-catch-covid-19-there-is-a-growing-consensus-11592317650
NYT invented "four Cs", three Cs + "choice". https://www.nytimes.com/2020/06/06/health/virus-reopenings.html
> Since most transmission happens only in a small number of similar situations, it may be possible to come up with smart strategies to stop them from happening.
Curious? BTW there's a county in East Asia which came up with the strategy four months ago. https://twitter.com/nytimes/status/1277914787117137921
Curious? BTW there's a county in East Asia which came up with the strategy four months ago. https://twitter.com/nytimes/status/1277914787117137921
Perhaps slightly off-topic to this thread but here's a great thread by @nataliexdean on Japan's "cluster busting", three Cs, and contact tracing. https://twitter.com/nataliexdean/status/1278748748374577153?s=20
