Just a single dose gives you a significant improvement in odds after just a few days, so breath easy!
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In theory this is like figuring any other odds: What are the odds that you'll be in the airspace of someone who has Covid and is in the infectious stage? What are the odds that your mask will filter out enough of whatever virus is in the air from that person to prevent you becoming infected? What are the odds of the first Pfizer shot having generated enough immunity already to kill any Covid virus that does end up in your respiratory system? Multiply it all together, and you end up with pretty good odds that you won't get Covid.
Wrap up and open the car window
. Maybe she will get the point. It is all playing the odds. I am fully vaccinated but am aware I do not have a big V on my forehead so I wear a mask, in addition to all the other reasons, so people who are afraid can relax a little.
One thing that confuses me is use of masks in outdoor spaces. I/we don't wear ours when walking around the neighborhood or in the park. About half of people do and half don't outdoors. From what I have read, the odds of inhaling enough virus outdoors is minimal and trying to take a brisk walk or run with a mask on makes it especially hard to breathe. I wouldn't go to a crowded event outdoors without one but otherwise...
I'm very cautious, but I agree with your reasoning. In fact I figure if I'm outside and more than 10 feet from the nearest person I'm pretty safe if there are only a few scattered people around. The problem is there is always some maskless butthead who will walk right up to you, often from behind or from one side, and start talking to you. So I always wear a mask if I'm in a public place. The only exception is when I'm riding my motorcycle. I feel safe then because most cars turn on their heat or air-conditioning and keep their windows closed.
I carry a mask when doing things outdoors, in case for some reason I have to get close to someone. I try to arrange things so that this doesn't happen. I did this pre-pandemic as well though :-)
I can't think of any rational support for me wearing a mask when hiking on the 80 miles of empty trails on the mountain I live on. I mean, when the weather is bad, I wear something over my face to avoid freezing, but that's a different issue.
So the CDC says students can now be 3 not 6 feet apart because masks will protect them. If masks really protected them then they could sit shoulder to shoulder. Obviously masks do not stop covid transmission or given all the masks being worn the disease would have gone away by now.