2) “We analyzed 3,184 cases of coronavirus disease in Japan and identified 61 case-clusters in healthcare facilities, restaurants and bars, workplaces, and music events.”
These appears to be the main hot spots - especially young people hotspots.
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3) “We also identified 22 probable primary case-patients for the clusters; most were 20–39 years of age and presymptomatic or asymptomatic at virus transmission.”
And of the hotspots, 20-39 years who had no symptoms were the main primary SOURCE of these hotspot clusters!!!Show this thread -
4) Visual summary of these 61 clusters by hotspot locations.pic.twitter.com/9zDhSDOT3R
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5) “61 COVID-19 clusters in various communities. We observed clusters of COVID-19 cases from 18 (30%) healthcare facilities; 10 (16%) care facilities of other types, such as nursing homes and day care centers; 10 (16%) restaurants or bars; 8 (13%) workplaces...”
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6) “7 (11%) music-related events, such as live music concerts, chorus group rehearsals, and karaoke parties; 5 (8%) gymnasiums; 2 (3%) ceremonial functions; and 1 (2%) transportation-related incident in an airplane”
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7) “The largest non–healthcare-related cluster we observed was among >30 persons who attended a live music concert, including performers, audience members, and event staff.” WELP!
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8) “We identified 22 probable primary case-patients who had symptoms develop before they had contact w/ other case-patients in a cluster or who had prior epidemiologic links before contact with a cluster. We did not identify probable primary cases for (hospital) clusters.”
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9) “We believe these 22 case-patients contributed to the incidence of clusters. Demographic show 9 (41%) probable primary case-patients were female & 13 (59%) were male. The most frequently observed age groups among primary cases were 20–29 years (27%) and 30–39 years (23%)”
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10) “For 16 clusters, we determined date of transmission and found 41% of probable primary case-patients were presymptomatic or asymptomatic at the time of transmission; only 1 had a cough at the time of transmission!”
MANY NO SYMPTOMS FOR INITIAL OUTBREAK EVENT! Masks now!pic.twitter.com/zAD7aELGje
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11) “Of 16 probable primary case-patients w/ determined date of transmission: they occurred
one day before illness onset for (31%) cases and
on the same day of illness onset for (25%) cases.
All age groups demonstrated presymptomatic or asymptomatic transmission”
!!!pic.twitter.com/rUOXyq948i
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12) “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”
again, riskiest outbreak hotspots.Show this thread -
13) I was EXTREMELY worried about this EXACT ISSUE months ago - this post warning thread below was when I tried to raise alarm about young adults being the riskiest age group for transmission back in mid March... almost 3 months ago. Oy. https://twitter.com/drericding/status/1239041092978343937?s=21 …https://twitter.com/DrEricDing/status/1239041092978343937 …
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14)
BOTTOMLINE: Now months later, we have indeed confirmed from Japanese contact tracing of clusters, that most outbreak clusters all started from primary cases who were YOUNG, many NO SYMPTOMS, and in all the hotspots that public health officials have been warning about...Show this thread -
15) Thus, this wealth of
#COVID19 data (thanks to rigorous *contact tracing*) have taught us that we need to always erring on side of caution with this coronavirus, and consider risks not just who is sick/dying, but who is sparking the epidemic most! And we all need masks now!
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16) DEAR YOUNG PEOPLE:
You may feel invincible, but you’re not.
You may be inconvenienced the most by the distancing and mask wearing - but it’s important.
You and your friends may mostly feel fine - but you’re the riskiest carrier group of all.
Please think of others.Show this thread
End of conversation
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