Sorry, I don't do random Google searches for hope-casted crap. I do however, from time to time, check in with the CDC. Since sucking eggs is your bag baby, today is your lucky day:
CDC guidelines say wearing a mask during prolonged exposure to coronavirus won't prevent possible infection
Originally Posted by Why_Yes_I_Do
So you do admit there are lots of peer reviewed, published studies that support wearing masks to prevent spread of Covid 19 and SARS? They're all just hope-casted crap?
You still appear to be confused. Influenza is not caused by a coronavirus. Covid 19, SARS and MERS are.
A quote from your link above, one of several publications by the CDC that you twist around to try to indicate masks aren't good for shit: In July,
Dr. Robert Redfield, director for the CDC, said, "If we could get everyone to wear a mask right now, I think in four, six, eight weeks, we could bring this epidemic under control.”
From Lancet, this is worth reading, a summary of an analysis of "
172 observational studies and rigorously synthesised available evidence from
44 comparative studies on SARS, Middle East respiratory syndrome (MERS), COVID19, and the betacoronaviruses that cause these diseases."
https://reader.elsevier.com/reader/s...E41D0C6F4B291F
Their findings showed a reduction in risk of 82% of getting infected by maintaining a physical distance of one meter in health-care and community settings. Every additional one meter of separation more than doubled the relative protection, up to three meters.
Masks and respirators reduced the risk of infection by 85% with greater effectiveness in health care settings than the community, which they attribute to the predominant use of N95 masks in health care settings. N95 respirators were 96% effective; other masks were 67% effective.
Eye protection resulted in a 78% reduction in infection in health care settings.
If you do nothing, take no precautions, the average person with Covid 19 transmits the disease to 3 other people. If you can reduce that ratio to under 1, then the disease dies out, as long as the ratio stays below 1. Yeah, you're not going to reduce the probability to "0" that somebody will transmits Covid 19 if everybody wears masks or social distances. But you can reduce it enough with those sorts of measures to get below an infection transmission rate of 1, at much lower cost to the economy than a lockdown or letting the disease run rampant.
Say a person is infected with Covid and doesn't know it, which may be the case for the majority of interactions, either because he doesn't have symptoms yet (so doesn't know to stay home) or is asymptomatic or thinks he just has something like a cold. And say he stays at least a meter away from other people. So, being conservative based on the above, maybe that reduces the probability he'll transmit the disease by 70%. And say he and others are wearing masks. Knock off another 60%. At this point if you do the math and if these are independent variables, you've reduced the probability of transmission by 88%. Add in eye protection and you're doing even better. And obviously, as you've stated, if people who are symptomatic would stay home that would help a lot. Not as many people die. You don't have as much damage to the economy. It's pretty simple.