Now that the medical advice seem to be coming round to actually giving honest advice, it's good to have a mask. Weeks wasted and god knows how many infected that didn't need to be, but now there's no excuse for not wearing one ... other than you may not have any.
You can make them of course, if you have a sewing machine. But even if you don't, you can make one using the blue shop-towel, a couple of elastic bands and a stapler. Even for home-made sewn masks, the blue shop towels are apparently one of the best things to use for filtering (two layers).
Mask-up people!
https://www.facebook.com/ShopTowelMask/
https://www.businessinsider.com/homemade-mask-using-hydro-knit-shop-towel-filters-better-2020-4