This is because, even with a regular body temperature of the person wearing the
mask (not accounting for fever), within two or more hours of wear, the mask
becomes moist and microorganisms begin to rapidly grow and multiply in it. These
viral and infectious particles can then escape the mask due to regular airflow,
evaporation, as well as wind, thus making something that was supposed to be a
barrier between the carrier and the outside world (the mask) the source of infectious
spread. People also love to leave these masks hanging on their rearview mirrors in
the car and nicely aerosolize everything on the mask into the car by their ac or
heating blowing directly on the mask and then inhale these particles.”
According to the article, "Masks Don't Work: A Review of Science Relevant to
COVID-19 Social Policy," authored by a noted Canadian physicist D.G. Rancourt,:
"Masks and respirators do not work. There have been extensive randomized
controlled trial (RCT) studies, and meta-analysis reviews of RCT [randomized
control trial] studies, which all show that masks and respirators do not work to
prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be
transmitted by droplets and aerosol particles. Furthermore, the relevant known
physics and biology, which I review, are such that masks and respirators should not
work. It would be a paradox if masks and respirators worked, given what we know
about viral respiratory diseases: The main transmission path is long-residence-time
aerosol particles (< 2.5 um), which are too fine to be blocked, and the minimum-
infective-dose is smaller than one aerosol particle. [Further] the slightest (even
momentary) facial misfit of a mask or respirator renders the design filtration norm
of the mask or respirator entirely irrelevant.”
(hitps://www.researchgate.net/.../340570735 Masks Don't _Work_A...)
According to a study published in the British Medical Journal:
“This study is the first [RCT] randomized controlled trial of cloth masks. The
results caution against the use of cloth masks. This is an important finding to
inform occupational health and safety. Moisture retention, reuse of cloth masks, and
poor filtration may result in increased risk of infection. The rates of all infection
outcomes were highest in the cloth mask arm, with the rate of influenza like illness
statistically significantly higher in the cloth mask arm compared with the medical
mask arm. Cloth masks also had significantly higher rates of influenza like illness
compared with the control arm."
(https://bmjopen.bmj.com/content/5/4/e006577 or https://www.ncbi.nlm.nih.gov/p
me/articles/PMC4420971/)
