To block a variant this transmissible, scientists say you need an N95 or other high-filtration mask. Here's how to find a good one and when to wear it.
As the Omicron variant spreads, it's time to upgrade from your cloth face masks. Experts explain why medical-grade masks -- such as surgical/disposable masks and N95 and KN95 respirators -- are better options now and what people should do with the cloth masks they already have.
droplet 也许弹射得远，particle 飘浮得远，所以是各有千秋。Viruses are infectious particles about 100 times smaller than bacteria and can only be observed by electron microscopy.
-the_dumb_one(悔不该);
2021-12-25(#14214708@0)
To block a variant this transmissible, scientists say you need an N95 or other high-filtration mask. Here's how to find a good one and when to wear it.
Viruses are infectious particles about 100 times smaller than bacteria and can only be observed by electron microscopy. 什么质地的口罩可以对付只有细菌1%体积的病毒？
-the_dumb_one(悔不该);
2021-12-25{281}(#14214716@0)
