New study on Effectiveness Of Masks

The Danish randomized controlled trial on the real-world efficacy of face masks against coronavirus infection – the first of its kind – has now been published in the Annals of Internal Medicine. As expected, the trial

. The study used “high-quality surgical masks with a filtration rate of 98%”.

For political reasons, three major journals had previously refused to publish the Danish study.

Meanwhile, US researcher Yinon Weiss has updated his charts on mask mandates and coronavirus infections in various countries and US states. The charts indicate that mask mandates have made no difference, and may even have been counterproductive.

People who want to avoid a coronavirus infection must avoid situations in which they can get infected. If they cannot avoid such situations, and if they belong to a high-risk group, they should discuss prophylactic and early treatment options with their doctor, which according to international studies may reduce the risk of severe disease and hospitalization by up to 90%.

The Danish study: Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers. A Randomized Controlled Trial. AIM 2020.

Study source:


Masks do not prevent virus respiratory illness. Size matters:

  • Viruses are 50x smaller than bacteria and 1000x smaller than a hair
  • Size of bacteria = 5 micrometer (5 μm)
  • Size of particles in wood smoke (wildfire): 0.4-0.7 micrometers (0.5 μm)
  • Size of virus = 0.1 micrometer (Influenza and SARS-CoV-2) (0.1 μm)
  • Comparison: human hair is 100 micrometers (100 μm)
    (one million micrometers = one meter)

CDC: “Cloth masks do not even catch small harmful particles in smoke.”

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