1. Use a mask to carefully cover the mouth and nose and tie them firmly to minimize the gap between the face and the mask;
2. When using, avoid touching the mask-after touching the used mask, for example, to remove or clean the mask, wash your hands with soap and water or use alcohol hand sanitizer;
3. After the mask is damp or contaminated with moisture, put on a new clean and dry mask;
4. Do not reuse disposable masks. Disposable masks should be discarded after each use.