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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).

good website about masks :

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

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.


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