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gsgs:
protective effect of masks and respirators against clinical respiratory illness (CRI)
(risk ratio [RR] = 0.59; 95% confidence interval [CI]:0.460.77) and influenza-like
illness (ILI) (RR = 0.34; 95% CI:0.140.82). Compared to masks, N95 respirators
conferred superior protection against CRI (RR = 0.47; 95% CI: 0.360.62) and
laboratory-confirmed bacterial (RR = 0.46; 95% CI: 0.340.62), but not viral infections
or ILI. Meta-analysis of observational studies provided evidence of a protective effect
of masks (OR = 0.13; 95% CI: 0.030.62) and respirators (OR = 0.12; 95% CI: 0.060.26)
 against severe acute respiratory syndrome (SARS).

https://academic.oup.com/cid/article/65/11/1934/4068747

gsgs:
good website about masks :
https://smartairfilters.com/en/blog/coronavirus-pollution-masks-n95-surgical-mask/

gsgs:
https://www.ncbi.nlm.nih.gov/pubmed/30229968
2018
It was found that a 50% compliance in donning the device resulted in a significant
(at least 50% prevalence and 20% cumulative incidence) reduction in risk for fitted
and unfitted N95 respirators, high-filtration surgical masks, and both low-filtration
and high-filtration pediatric masks. An 80% compliance rate essentially eliminated
 the influenza outbreak. T

gsgs:
Stanford: N95 masks can be decontaminated without decreasing filtration efficiency
using 70C heat for 30 min. Alcohol and bleach should not be used. Report here if you click on the link.
https://www.covid19ether.com/blog/c/0/i/43928911/n95-mask-can-be-decontaminated-without-decreasing-filtration-efficiency

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