Fig. 6 Relationship between indoor CO, concentration and infection probability of SARS-CoV-2 in the inpatient setting.
No mask vs leaky surgical mask vs N95 mask.
In a typical inpatient setting, required indoor CO2 concentration at which R0 (# of people one infected person will pass on a virus to) does not exceed 1
is below 540 ppm with no mask
770 ppm with a surgical mask,
8200 ppm with an N95 mask
Fig. 4 Relationship between the indoor CO2 concentration and infection probability in the outpatient setting
No mask vs leaky surgical mask vs N95 mask.
In a typical outpatient setting, the required indoor CO2 concentration at which R0 (# of people that one infected person will pass on a virus to, on average ) does not exceed 1.
is below 620 ppm with no mask,
1,000 ppm with a surgical mask
16,000 ppm with an N95 mask.
R0, ( the number of people that one infected person will pass on a virus to, on average) for each measurement in a collagen ward. Leaky surgical mask vs N95 mask
These results, suggest that the risk of airborne transmission can be significantly reduced by wearing N95 masks inside the ward.
However, it is impossible for all patients to wear N95 masks in the hospital.
Therefore, maintaining good ventilation as much as possible is the feasible alternative measure to prevent airborne transmission in the ward.
@protectbc.bsky.social Now BC's PHO has finally put in #MaskMandates in healthcare, please do a post on this study on massive differences between no masks, leaky surgical masks, vs N95 masks
BC needs #N95MaskMandates not unsafe leaky surgical masks
link.springer.com/article/10.1... #bcpoli