Categories
News

Face shields ineffective at trapping aerosols, says Japanese supercomputer – The Guardian

Plastic face shields are almost totally ineffective at trapping respiratory aerosols, according to modelling in Japan, casting doubt on their effectiveness in preventing the spread of coronavirus.

A simulation using Fugaku, the world’s fastest supercomputer, found that almost 100% of airborne droplets of less than 5 micrometres in size escaped through plastic visors of the kind often used by people working in service industries.

In addition, about half of larger droplets measuring 50 micrometres found their way into the air, according to Riken, a government-backed research institute in the western city of Kobe.

https://www.theguardian.com/world/2020/sep/22/face-shields-ineffective-trapping-aerosols-japanese-supercomputer-coronavirus

Categories
Opinion

Ignoring the Covid evidence – Alistair Haimes, The Critic

  • Far from following the science, the government turned its back on all available data.
  • Until mid-April, with the escalating deaths in care homes agonisingly clear across Europe, government policy was still for patients to be discharged to care homes from hospitals without requiring negative tests. And so the toll: around half of UK Covid-19 deaths are care home residents, despite them accounting for only 0.6 per cent of our population.
  • Germany, whose population is roughly 25 per cent bigger than ours, has suffered approximately a quarter of our Covid deaths.
  • Ministers have deferred to scientists who themselves deferred to the projections of models, even when data on the ground told a completely different story.
  • Statisticians on social media had a field day pointing out the chasm between modelled outcomes and reality, but it is not clear that the models on which SAGE relied (both their input parameters and mechanical dynamics) were continually refined with on-the-ground data (or simply discarded as wrong). 
  • Why weren’t Oxford’s team, who specialise in zoonotic viruses and who looked at the same data as Neil Ferguson’s modelling-led team but came to wildly different conclusions, on SAGE’s panel to provide an alternative view?
  • Why were there no economists on SAGE? Economics is not the bloodless pursuit of money but the science of decision-making under uncertainty where resources are finite; could they really have brought nothing to the party?
  • In mid-March, Stanford’s Nobel laureate Michael Levitt (biophysicist and professor of structural biology) discussed the “natural experiment” of the Diamond Princess cruise ship, a petridish disproportionately filled with the most susceptible age and health groups. Even here, despite the virus spreading uncontrolled onboard for at least two weeks, infection only reached a minority of passengers and crew. 
  • The data towards the end of March clearly showed we were already near the tipping point of the bell-curve (meaning the disease is on the wane). We were already past the point where lockdown could have made much difference.
  • Knut Wittkowski: “respiratory diseases [including Covid-19] . . . remain only about two months in any given population”. 

https://thecritic.co.uk/issues/july-august-2020/ignoring-the-covid-evidence/

Categories
Publications

Diamond Princess 48% test-positive cases remained completely symptom-free – National Institute of Infectious Diseases Japan

https://www.niid.go.jp/niid/en/2019-ncov-e/9407-covid-dp-fe-01.html

Categories
News

Where is Japan’s coronavirus explosion? – Japan Times

https://www.japantimes.co.jp/news/2020/03/20/national/coronavirus-explosion-expected-japan/