Earlier quoted context omitted.
Weeks ago the CDC lied, saying that masks aren't effective and that the general public shouldn't wear them. They did this ostensibly to keep the existing mask supply available only to medical workers. Needless to say, if they're ineffective for the general public, they're ineffective for doctors and nurses. And so people saw through the bullshit
This is seriously and dangerously wrong information. Surgical masks are particularly helpful in stopping _infected_ people from spreading the disease. New information and data on asymptomatic spreaders means that the CDC (and many other Western health authorities) are considering changing their advice. The idea is that everyone must assume they are an asymptomatic spreader. Additionally, surgical masks aren't the onl…
Note the following points, with sources (The context is a bit off because I did this research in response to another question, but the points are still pretty much relevant here):
1. Regular old surgical masks (not N95 respirators), when worn by the public without training, had a strong protective effect for the people wearing them during the SARS-CoV-1 outbreak. They reduced the risk of infection by ~70%. (Source: https://wwwnc.cdc.gov/eid/article/10/2/03-0730_article)
2. Despite being very different in their ability to actually filter out fine particles, N95 respirators and surgical masks actually show no significant difference in their ability to prevent diagnosed respiratory infections including influenza, when worn by healthcare workers according to two large meta-studies. Though both had a protective effect over no mask. (Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4868605/) (2nd source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5779801/)
3. Improvised, homemade masks have only a marginally lower filtration efficiency than surgical masks (which we established are about as effective as an N95 respirator anyway). (Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440799/) (2nd source: https://www.researchgate.net/publication/258525804_Testing_t...)
4. There is evidence in the studies linked in item 2 that hand hygiene alone did not demonstrate much of a protective effect (for civilians caring for a sick family member) against transmission of influenza compared to use of any type of mask.
5. When infected people wear a mask, it helps reduce the amount of viral shedding which occurs, presumably making them less likely to infect others. (Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3591312/)