[j7ake]

This advice is completely contrary to anything that happens inside a hospital. Nurses and doctors are wearing surgical masks (and N95 masks plus face shield if performing actions that may generate aerosols) to protect themselves from getting sick while treating patients.

The problem is that you can have COVID19 and be contagious without showing symptoms. Mandating everybody to wear some sort of mask should reduce transmissions because it should reduce the viral load in the air. By how much? It is not clear, but it's not worth waiting for results from a randomized double blind clinical trial during a global pandemic. I would put money that the effect of putting on a mask will be at least as effective as washing hands.

The danger to be careful of is if wearing mask can make you more sick, but the current actions from healthcare workers around the world suggests it is not the case.

Another point some people argue is that wearing a mask in public means one less mask for health care workers. This is false on two fronts, one because mask supplies will soon flood the market and there are DIY solutions to masks that can reduce transmissibility; two because what's best for health care workers is not to get sick at all.

[foobarian]

I am hopeful that the US public may warm up to masks in public in the future. It seems likely this would cut down on the spread of seasonal flu and common colds.