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Eric Feigl-Ding Profile picture
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12 May, 8 tweets, 3 min read
Worrisome cluster at Singapore 🇸🇬 @ChangiAirport of many #B1617 Indian variant (+pending). 92% of aviation staff vaccinated—of primary cases: 11 breakthroughs in vaccinated airport staff, 3 in unvaccinated staff, 4 non-airport staff unvaccinated. #MaskUp🧵
channelnewsasia.com/news/singapore…
2) The Civil Aviation Authority of Singapore (CAAS) and Changi Airport Group (CAG) said on Sunday that all workers in Changi Airport’s operating terminals will be tested for COVID-19 in a special testing operation.
3) About 9,000 workers from Terminal 1, Terminal 3 and Jewel Changi Airport will undergo these tests. Terminal 2 is not open.
All vaccinated frontline airport workers will also be tested every 14 days as part of rostered routine testing, up from the 28 days previously.
4) Seven new cases, including household contacts and family members of previous cases, were on Tuesday (May 11) linked to a cluster of COVID-19 infections at Changi Airport.
5) A Victoria Junior College student who tested positive last week was also linked on Tuesday to the cluster at the airport, taking total number of cases in the cluster to 18.

Of the 7 new cases, 4 tested preliminarily positive for B1617 variant, first detected in India.
6) Airport staff seem high exposure groups. In NZ where there is near zero Covid, we also saw a case of an airplane cleaner who got infected despite no passenger exposure.
7) meanwhile in England… #B16172 is spreading extremely fast.
8) #B16172 is poised to take over the UK.

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More from @DrEricDing

Eric Feigl-Ding Profile picture
14 May
⚠️BREAKING—Singapore 🇸🇬 returning to lockdown mode for one month as #COVID19 cases rise, many #B16172 variants. Indoor dining suspended immediately. Travel bubble with HK🇭🇰 now unlikely. 31% of Singaporeans have >=1 shot, 22% fully vaccinated. Still surge.
bloomberg.com/news/articles/… Image
2) 🇸🇬 is returning to the lockdown-like conditions it last imposed a year ago, banning dining-in and limiting gatherings to two people, as a rising number of untraceable virus infections pressures one of the most successful places in the world at Covid containment.

➡️YET STILL!
3) “A pattern of local unlinked community cases has emerged and is persisting,” the statement said. “We need to act decisively to contain these risks as any one leak could result in an uncontrolled resurgence of cases.”
Read 7 tweets
Eric Feigl-Ding Profile picture
14 May
Familiar? 80 years ago—one man (Wells) discovered viruses were airborne & UV light led to fewer sick kids. He was dismissed at the time—by chief epidemiologist of the CDC. The CDC panned the idea measles was airborne for many decades. They were dead wrong.
wired.com/story/the-teen… Image
2) The distinction between droplet and airborne transmission has enormous consequences. To combat droplets, a leading precaution is to wash hands. To fight infectious aerosols, the air itself is the enemy. In hospitals, that means expensive isolation wards and N95 masks for all.
3) “The books @linseymarr flipped through drew the line between droplets & aerosols at 5 microns. A micron is a unit of measurement equal to one-millionth of a meter. By this definition, any infectious particle <5 microns in diameter is an aerosol; bigger is a droplet.”
Read 44 tweets
Eric Feigl-Ding Profile picture
14 May
FACT: Asymptomatic cases can still spread the coronavirus to someone vulnerable.

Vaccinate but still try to protect others who cannot / unable / unwilling (yes, let’s protect them too). #COVID19 #empathy Image
2) But homes, schools, and businesses are not HBO TV show sets with unlimited testing budgets. How many transmissions will there be if we ditch masks too early? variety.com/2021/tv/news/b…
3) We also aren’t rich like the Yankees— 8th member, shortstop Gleyber Torres, is positive for #COVID19 in latest team outbreak. All 8 members are fully vaccinated, thus “breakthrough positives.” Too early to ditch masks. Think of others not vaccinated yet.forbes.com/sites/joshuaco…
Read 4 tweets
Eric Feigl-Ding Profile picture
14 May
Bill Maher has tested positive for #COVID19. HBO says he was “fully vaccinated”. HBO insists he “feels fine”, yet was forced to scrap Friday’s scheduled taping of @RealTimers.
variety.com/2021/tv/news/b…
2) To be clear—I am absolutely for vaccinations. But homes, schools, and businesses are not HBO TV show sets with unlimited testing budgets. How many transmissions will there be if we ditch masks too early?
3) NY Yankees announced 8th member, shortstop Gleyber Torres, is positive for #COVID19 in latest team outbreak. All 8 members are fully vaccinated, thus “breakthrough positives.” Plus, Torres had Covid in Dec 2020, so also a reinfection. By @JoshuaPCohen1
forbes.com/sites/joshuaco…
Read 4 tweets
Eric Feigl-Ding Profile picture
13 May
Not pleased at all—In a sharp turnabout from previous advice, CDC on Thursday said fully vaccinated may stop wearing masks or maintaining social distance in most indoor and outdoor settings, regardless of size, regardless of others.

Too early. #COVID19
nytimes.com/2021/05/13/hea…
2) This is too risky in my opinion. asymptomatic transmission efficacy is only in the 70s-80s even for the best vaccines. Much lower for others and for some variants.
3) “Walensky's announcement have a few caveats. She warned that people who are immune compromised should speak with their doctors before giving up their masks.”
Read 17 tweets
Eric Feigl-Ding Profile picture
13 May
📍My god… the upgraded warning #B16172 variant (magenta) is surging so fast. Epidemiologists now estimate it is 60% faster than even #B117 UK/Kent variant, which is already 50% faster. If true, it could make it fastest transmission one to be found worldwide. Thread 🧵. #COVID19 Image
2) #B1672 has become quite dominant in India 🇮🇳 sequenced samples in @GISAID data. And it is projected to take over further by June. Figure from @TWenseleers.

Some say it could be due to sampling, but Tom doesn’t think so because #B16171 wouldn’t be selectively withheld. Image
3) @TWenseleers used his methods from earlier paper to estimate the new #B16172 transmission being 60% fast than the U.K. Kent #B117 variant.
Read 11 tweets

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