1/9 - “On July 18, 2020, the Western Sydney Public Health Unit was notified of a positive #SARSCoV2 test result for an 18-year-old man. He reported symptom onset of malaise and headache on July 16 and cough and fever on July 17. He was a church chorist.”
wwwnc.cdc.gov/eid/article/27…
2/9 - “The case-patient had sung from a choir loft, elevated 3.5 m above the congregation, which he entered before and left after the service. He denied touching objects in the church or mixing with the congregation. Video recordings of the services corroborated this history.”
3/9 - “On July 19, the church informed the community about the case-patient, prompting testing among members. On July 20, 2 additional case-patients who reported attendance on July 15 and 16 [were notified]. Neither was known by the primary case-patient.”
4/9 - “We detected 12 secondary case-patients among 508 service attendees, yielding an overall secondary attack rate (SAR) of 2.4% across the 4 services. [...] There were no deaths, although 3 case-patients were hospitalized, including 2 who required intensive care.”
5/9 -“Secondary case-patients showed development of symptoms 2–12 days after exposure. 5 of the secondary case-patients were from the same households as earlier cluster case-patients. Thus, these case-patients might have been infected within the household rather than the church.”
6/9 - “#SARSCoV2 genome sequencing was performed for the primary case-patient and 10 secondary case-patients (6). These case-patients formed a single genomic cluster with a maximum of 2 nt changes from the #SARSCoV2 genome of the primary case-patient.”
7/9 - “To further characterize exposures, we determined the seating positions of secondary case-patients within the church. We asked case-patients to describe where they sat, and the video recordings of the services were reviewed, jointly with the case-patients where possible.”
8/9 - “The church had a high conical roof, and the ventilation system at the apex was not in operation during the services. The doors and windows were largely closed, except as persons entered and exited, and the wall fans were off, meaning there was minimal ventilation.”
9/9 - “Transmission during this outbreak is best explained by airborne spread [3 arguments]:
1. Singing generates more respiratory aerosol particles and droplets than talking;
2. Minimal ventilation;
3. The primary case-patient near its peak of infectiousness (low Ct values).”

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More from @FLAHAULT

6 Apr
1/6 - “The Indian state of Maharashtra, home to financial capital Mumbai and more than 100m people, introduced sweeping restrictions on the public and businesses as the country’s daily Covid-19 caseload hit a record high.”
ft.com/content/5b5443…
2/6 - “India reported 103,000 new Covid-19 cases on Sunday, registering the highest number of daily infections globally. It surpassed its previous peak of nearly 100,000 daily cases in September.”
3/6 - “The restrictions in Maharashtra include a night-time curfew and weekend lockdown, while all but essential shops are to close. Most private offices will shut, restaurants only be available for takeaway and public gatherings have been curtailed.”
Read 6 tweets
6 Apr
1/15 - “More than a year after the start of the pandemic, Europe is enduring a grim spring. #COVID19 infections, hosp and deaths are rising in many countries [...] with a more infectious variant, a shortage of vaccines and public weariness with lockdowns.”
ft.com/content/d1af35…
2/15 - “In 2 weeks, the number of recorded new cases in France had risen 55% to about 38,000 a day. This 2-week growth compares with a rise of 95% in Belgium and 48% in the Netherlands; in Germany, they have risen 75%. Part of this increase reflects an expansion in testing.”
3/15 - “The latest pandemic surge in Europe, triggered by the spread of the now dominant B.1.1.7 strain of the virus first noted in England, is often called a “third wave”, but observed across the continent as a whole it is more like a confused sea.”
Read 11 tweets
6 Apr
1/22. Apr 06 to Apr 12 -
Daily #COVID19 epidemic forecasting for 192 countries/territories. Vaccine figures per country in summary tables.
Dashboard: renkulab.shinyapps.io/COVID-19-Epide…
Data source: coronavirus.jhu.edu & ourworldindata.org/coronavirus
Powered by @ISG_UNIGE & @SDSCdatascience Image
2/22. Portugal (and the United-Kingdom) have both landed in their #COVID19 safety zones, and will stay in them, R-eff=0.94 (and 0.77), with very low levels of mortality, for 7 more days.

In PRT (and the UK), 13% (and 45%) received at least one dose of vaccine. ImageImageImageImage
3/22. Ireland (and Denmark) are slowly landing towards their #COVID19 safety zone, with R-eff=0.93 (and 0.96), at medium levels, and decreasing (plateauing) in mortality, at low (very low) level, for 7 more days. ImageImageImageImage
Read 24 tweets
6 Apr
1/11 - France - Apr 06 to Apr 12 -
#COVID19 is in red zones, i.e. deteriorating in all Départements.
Increase in mortality in most areas.
Schools closed from Tuesday for 3 weeks.
renkulab.shinyapps.io/COVID-19-Epide…
Powered by @ISG_UNIGE & @SDSCdatascience Image
2/11 - Auvergne-Rhône-Alpes is experiencing a rise, at high level, in its #COVID19 epidemic activity (R-eff=1.11), increasing in mortality at high levels, for 7 more days.

Bourgogne-et-Franche-Comté are rising at high level too (1.13), with high mortality. ImageImageImageImage
3/11 - Corsica is plateauing at high levels of activity, in its #COVID19 epidemic activity (R-eff=1.04), with no expected mortality, for 7 more days. ImageImage
Read 13 tweets
5 Apr
1/9 - “Millions of Hindus have gathered on the banks of India’s sacred Ganges river to celebrate the Kumbh Mela, even as health officials warned that the country’s health system was at serious risk from surging #COVID19 cases.”
ft.com/content/1b50e4…
2/9 - “Public health experts feared the month-long festival, which is expected to draw tens of millions of pilgrims to the temple town of Haridwar in Uttarakhand province, will accelerate infections. Cases have already risen sharply across the country in recent weeks.”
3/9 - “It’s obviously a matter of great concern,” said K Srinath Reddy, president of the Public Health Foundation of India, a charity. “Any large gathering of people has the potential to be a superspreader event.”
Read 9 tweets
5 Apr
1/9 - “Il est capital d’associer une ambitieuse politique de vaccination de toute la population, à une stratégie complémentaire dite de « suppression » c’est-à-dire visant la circulation minimale du virus sur le territoire.”
atlantico.fr/article/decryp…
2/9 - “Avec une couverture vaccinale certes presque 3 fois plus élevée aux USA qu’en Europe (30 contre 12%), mais très inférieure au seuil d’immunité collective, on ne pouvait pas espérer que les USA puissent se trouver en mesure de bloquer une nouvelle vague de contaminations.”
3/9 - “Seuls les pays qui arriveront à réduire substantiellement la circulation du virus devraient pouvoir être en mesure de rouvrir rapidement leur vie sociale et économique, tout en continuant à vacciner massivement leur population.”
Read 9 tweets

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