Johns Hopkins Medicine – Wearing a face mask in public helps prevent the spread of COVID-19 — but only if worn properly, covering both your nose and mouth. Read our mask-wearing tips to get the maximum protection for yourself and others.


Johns Hopkins Medicine – Wearing a face mask in public helps prevent the spread of COVID-19 — but only if worn properly, covering both your nose and mouth. Read our mask-wearing tips to get the maximum protection for yourself and others.