Wash your hands frequently!
Regularly and thoroughly clean your hands with an alcohol-based hand rub or wash them with soap and water.
Why? Washing your hands with soap and water or using alcohol-based hand rub kills viruses that may be on your hands.
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Self Examination
Take a deep breath and hold it for more than 10 seconds. If you complete it successfully without discomfort, stuffiness or tightness it proves there is no fibrosis in the lungs, basically indicating no infection.