Reply To: SARS cov2 and Covid 19


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#62087
Dredd

Nothinguptop

“There is no scientific argument for healthy people to wear masks.
I know this and you if as claimed read science know this.”

Oh, really? “Science”, you say, mmm? (While referencing a pseudoscientist, I see.) OK, then. Let’s have a quick look at some of the relevant science.

“We recommend that public officials and governments strongly encourage the use of widespread face masks in public, including the use of appropriate regulation.”
Howard et al (2020). Face Masks Against COVID-19: An Evidence Review. Preprints.

“The results of this review revealed that the use of masks is associated with a protective effect against respiratory infections in healthcare facilities, in long-term care facilities and at mass gatherings.”
Olry de Labry-Lina et al. (2020). The use of masks to protect against respiratory infections: an umbrella review. Enfermedades Infecciosas y Microbiología Clínica.

“… wearing simple homemade or surgical face masks in public is highly recommended if no particle filtrating respiratory mask is available. Firstly, because they protect against habitual contact of the face with the hands and thus serve as self-protection against contact infection. Secondly, because the flow resistance of the masks ensures that the air remains close to the head when breathing, speaking, singing, coughing and sneezing, thus protecting other people if they have sufficient distance from each other.”
Kähler & Hain (2020). Fundamental protective mechanisms of face masks against droplet infections. Journal of Aerosol Science.

“The results of the current study add to the growing body of literature supporting the use of face masks as a measure to contain the spread of SARS-CoV-2 by retaining potentially contagious droplets that can infect other people and/or contaminate surfaces. Based on the current evidence, face masks should therefore be considered a useful and low-cost device in addition to social distancing and hand hygiene during the postlockdown phase.”
Landi et al. (2020). Should face masks be worn to contain the spread of COVID-19 in the postlockdown phase? Transactions of the Royal Society of Tropical Medicine & Hygiene.

“Because asymptomatic carriers of COVID-19 produce respiratory droplets that can remain suspended in air for several hours, social distancing may not be a reliable physical barrier to transmission. During the COVID-19 pandemic, however, some governments were reluctant to mandate public mask use out of concern this would worsen shortages of respirators for healthcare workers. Cloth masks with a filtering effectiveness of 70-90% can be made from widely available materials, and are a better option than respirators for the public.”
Salter (2020). Reinventing Cloth Masks in the Face of Pandemics. Risk Analysis.

“Conclusion: cloth face masks are a preventive measure with moderate efficacy in preventing the dissemination of respiratory infections caused by particles with the same size or smaller than those of SARS-CoV-2. The type of fabric used, number of layers and frequency of washings influence the efficacy of the barrier against droplets.”
Lima et al. (2020). Cloth face masks to prevent Covid-19 and other respiratory infections. Revista Latino-Americana de Enfermagem.

Those are just a few quick examples: I could fill your screen with dozens more … if I had time. But that’s the profound imbalance here. It doesn’t take many minutes to lift a rumour from a dubious pseudoscientific website and regurgitate it in a forum. Checking the relevant science takes a great deal longer; and it’s hardly the province of amateurs.