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  1. #9461
    Quote Originally Posted by cspan37421 View Post
    If you're talking about Worldometers, I had noticed in the past, at least with my state, that the numbers increase throughout the day until some final update. In other words, by midday there are partial counts and they update them as info comes in. One isn't assured that a day's number is final until they move it to the "yesterday" tab with all the others. In my state (TN) I typically see the last update between 4 and 7pm ET. Note that a lot of TN is on Central time.

    I've also noticed a "seasonality" on the weekends - under-reporting. I.e., I think declining numbers for Fri-Sat-Sun are common and meaningless. At least here.
    Worldmeters gets data from both the counties and the states. Counties in particular will have various reporting times.

  2. #9462
    Join Date
    Nov 2014
    Location
    The People's Republic of Travis County
    Quote Originally Posted by Mtn.Devil.91.92.01.10.15 View Post
    Ah... There's our 2020 zombie outbreak!
    Must spread comments, but exactly right, lol...

  3. #9463
    Quote Originally Posted by aimo View Post
    Locally, we are told that this is a result of fewer tests being done over the weekend.
    Test results take so long to get back here, I suspect it's less reporting done on the weekends, not (necessarily) less testing.

  4. #9464
    Join Date
    Nov 2014
    Location
    The People's Republic of Travis County
    Quote Originally Posted by freshmanjs View Post
    They are not newly stated. I said from the first discussion on existing immunity that itís a big if. And everyone knows vaccines are in the if category. Still no idea how you concluded I was suggesting that a majority of people should be infected.
    I concluded that you were referring to a majority of the population being infected, because that is what the advocacy for "herd immunity" in the COVID-19 context has taken as a given since the beginning of this pandemic (the best example being the initial UK "let it play out" plan). You've clarified that your view includes a working and safe vaccine and also the to-be-confirmed-but-anecdotally-promising potential that lots of people have at least partial immunity, possibly due to their vaccine histories. As I stated, I now am in agreement with what I understand your position to be.

  5. #9465
    Quote Originally Posted by cspan37421 View Post
    In the news headlines there's a study out from Duke on the efficacy of various types of masks and mask material.

    https://advances.sciencemag.org/cont...sciadv.abd3083

    Working from memory (and with a question of my own, or two, to follow):

    Some of the highlights include:

    Stretchy material, which I think means like that of "buffs" (a tube design that can be worn many ways) fared particularly badly. IIRC it performed worse, on average, than no mask at all! Knitted material performed worse than average.
    Bandanas were barely better than no mask at all. It appears they tested bandanas in what some have termed "7-11 mode".
    Short of FITTED N95 and surgical masks, poly/cotton blends performed best, with cotton masks also doing well.

    Questions - assuming these findings can be replicated / are true:

    Would bandanas perform as badly if folded to hold the shape of a more traditional mask? I.e., is it gapping around the jawline that allows relatively more particles to escape?

    I ask because in the early rush for masks, I opted to wear bandanas. I already had many of them and I wear them tight enough to be uncomfortable over the bridge of my nose. In my observations they certainly seal as well as most masks I see worn, esp. the 2 of mine which are 100% polyester. They're very clingy, and larger than the others, so I feel they seal quite well. The rest of mine are cotton, save for 1 cotton blend. I don't feel these others seal as well along my jawline, if worn in "triangle" aka 7-11 mode. I briefly tried another folding method that cradles the nose to chin area better, but the elastics (hair elastics borrowed from Mrs. Cspan) pulled on my ears to an extent that makes them a bit more prominent than I prefer. Maybe I'll work on finding a way to get a strap to wrap around the back of my head instead yanking open my car doors.

    I've seen a couple non-surgical, non-N95 designs that are nicely shaped and probably seal better than the rest. They're shaped in such a way that the front of them is somewhat ridged or peaked, rather than flat. Some examples I've seen are the Keen-labeled ones worn by REI employees when their stores reopened. I think those would be good; I don't know how they are secured, though. Didn't notice.

    Anyway, if these findings are accurate I realize I should change how I mask up, so for reusable masks, what's the retail landscape look like now? Any recommendations - particular brands, models, or stores to find them in? Prefer to buy in person. Thanks!!

    Depending upon the cloth material, they are mostly woven materials that follow a consistent pattern. So, essentially a net. As they get stretched, the holes in the net do get larger. Folding the material so that essentially it fills in the holes(so one layer 90 degrees to another) will perform much better than a single layer mask in my mind. My evidence for this is the relative performance of denim compared to other fabric materials. Denim generally is constructed of vertical and horizontal weaving patterns so fills in and reduces the size of the holes in the net.

    The reason the relatively inexpensive surgical mask works well is that is made from a nonwoven material(polypropylene) that has a relatively "random" pattern of small fibers. The N95 mask then includes layers of randomly dispersed microfibers. Using the net comparison, you are no longer using a net like a fishing net, but one of the strands going in random directions. This limits the stretchiness of the material but does provide immensely better filtration. FWIW, I used to manufacture the nonwoven materials used in those two types of masks a couple decades ago. The technology hasn't changed much since then.
    Last edited by YmoBeThere; Yesterday at 10:23 AM.

  6. #9466
    Quote Originally Posted by YmoBeThere View Post
    Depending upon the cloth material, they are mostly woven materials that follow a consistent pattern. So, essentially a net. As they get stretched, the holes in the net do get larger. Folding the material so that essentially it fills in the holes(so one layer 90 degrees to another) will perform much better than a single layer mask in my mind. My evidence for this is the relative performance of denim compared to other fabric materials. Denim generally is constructed of vertical and horizontal weaving patterns so fills in and reduces the size of the holes in the net.

    The reason the relatively inexpensive surgical mask works well is that is made from a nonwoven material(polypropylene) that has a relatively "random" pattern of small fibers. The N95 mask then includes layers of randomly dispersed microfibers. Using the net comparison, you are no longer using a net like a fishing net, but one of the strands going in random directions. This limits the stretchiness of the material but does provide immensely better filtration. FWIW, I used to manufacture the nonwoven materials used in those two types of masks a couple decades ago. The technology hasn't changed much since then.
    Thanks for your informative post. That all makes a lot of sense. Ironically, since I made my post, a friend offered a homemade cloth mask (pleated, 2 layers, with insert pocket), and it was a bit too large for Mrs. Cspan, but just right for me. Not sure of the material, other than I don't think it's cotton. Feels kind of like a poly wool blend.

  7. #9467
    Join Date
    Feb 2007
    Location
    Chesapeake, VA.
    Quote Originally Posted by MChambers View Post
    Here's a link to the WaPo story about the Russian vaccine: https://www.washingtonpost.com/world...129_story.html
    I like how they claim that immunity will last two years. I guess in addition to the vaccine they also have a time machine?

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