研究顯示，一般口罩不能有效地保護健康的人類免受感染。民眾通常不會正確地使用這些口罩，而且病毒是如此之小，以至於很容易滲透到口罩中。口罩邊緣也無法與皮膚形成良好的密封狀態。 口罩可以防止某種「飛濺」疾病的傳播（即其他人打噴嚏或咳嗽），但它們並非氣密，也不能保護您的眼睛，而這是病菌的另一個進入點。（訓練自己不要觸摸自己的臉將有助於大幅減少暴露於病菌之中！） x
When to use a mask -If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection. -Wear a mask if you are coughing or sneezing. -Masks are effective only when used in combination with frequent hand-cleaning with alcohol-based hand rub or soap and water. x
If you are NOT sick: You do not need to wear a facemask unless you are caring for someone who is sick (and they are not able to wear a facemask). Facemasks may be in short supply and they should be saved for caregivers. x
疫情雖然很嚇人，但別人告訴她口罩無法阻擋病毒感染，只是避免民眾用手觸碰臉部。
口罩可以防止某種「飛濺」疾病的傳播（即其他人打噴嚏或咳嗽），但它們並非氣密，也不能保護您的眼睛，而這是病菌的另一個進入點。（訓練自己不要觸摸自己的臉將有助於大幅減少暴露於病菌之中！） x
-If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection.
-Wear a mask if you are coughing or sneezing.
-Masks are effective only when used in combination with frequent hand-cleaning with alcohol-based hand rub or soap and water.
x