The following measures ARE NOT effective against COVID-2019 and can be harmful:
- Smoking
- Wearing multiple masks
- Taking antibiotics (See the answer to “Are there any medicines of therapies that can prevent or cure COVID-19?”)
In any case, if you have fever, cough and difficulty breathing seek medical care early to reduce the risk of developing a more severe infection and be sure to share your recent travel history with your health care provider.
Source: WHO