07/20—Physical distancing interventions and incidence of coronavirus disease 2019: natural experiment in 149 countries
Rapid inactivation of SARS-CoV-2 with Deep-UV LED irradiation
This in vitro study demonstrated that irradiation with a deep ultraviolet light-emitting diode (DUV-LED) of 280 ±5 nm wavelength rapidly inactivates SARS-CoV-2 obtained from a COVID-19 patient.
Mechanisms of Airborne Infection via Evaporating and Sedimenting Droplets Produced by Speaking
A single infected person that constantly speaks without a mouth cover produces a total steady-state air load of more than 104 virions at a given time. In a mid-size closed room, this leads to a viral inhalation frequency of at least 2.5 per minute. Low relative humidity, as encountered in airliners and inside buildings in winter, accelerates evaporation and thus keeps initially larger droplets suspended in air.
Socioeconomic correlates of the SARS-CoV 2 and Influenza H1N1 outbreaks
SARS-CoV 2 and H1N1 Influenza outbreaks were fundamentally different in affecting the 20 countries examined: the confirmed cases and deaths caused by the two outbreaks were not correlated. Surprisingly, SARS-CoV 2 cases were strongly correlated with economic output as measured by GDP and health expenditure, in stark contrast with H1N1 influenza cases, which were not associated with the above or any other socioeconomic index.
Physical distancing interventions and incidence of coronavirus disease 2019: natural experiment in 149 countries
On average, implementation of any physical distancing intervention was associated with an overall reduction in covid-19 incidence of 13% (IRR 0.87, 95% confidence interval 0.85 to 0.89; n=149 countries).
Contact Tracing during Coronavirus Disease Outbreak, South Korea, 2020
Of 10,592 household contacts, 11.8% had COVID-19. Of 48,481 nonhousehold contacts, 1.9% had COVID-19.
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