1月 15th, 2022
关于口罩
今日一个新闻引起我的注意。For the first time, the CDC said cloth masks weren’t as effective as other options. “Wear the most protective mask you can,” the agency urged.
有人总结了最近两年CDC对于口罩的建议：
CDC COVID guidance over two years:
-Don’t wear any masks.
-Wear cloth masks and facial coverings.
-Wear cloth masks but not bandanas or gaiters.
-Wear multiple masks.
-Just wear one mask.
-Wear cloth mask over surgical mask.
-Don’t wear cloth masks.
-Wear N95 or KN95.
我不是太理解为什么会这样。我不相信CDC会故意发布误导性的指引，我只能理解为现代医学能力还很有限，很多时候并不能给出又快又准确的结论，很多时候既然我们没办法选择在原地等待，那就只能在摸索中前行。
