Most likely they have been infected for a long time. According to some data, these are margelona worms, according to others, some kind of spraying of laboratory production. It can be dangerous anyway. We advise you to use a homemade mask and wash it yourself, you can steam it with an iron if anyone needs it for the store. But the situation is clearly premeditated.
Video below illustrates what lies within the masks you have been wearing all this time!