“Masks work. There is widespread evidence from the field of occupational health, the SARS epidemic, and other outbreaks that wearing masks protects us from germs and interrupts the transmission of disease from sick to healthy people…handwashing, social distancing, and doing your best not to touch your face are not enough to stop the coronavirus. For…

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A new study from China suggests asymptomatic people spread COVID-19 the most. “Stealth transmission refers to the fact that people who have mild, non-discrete symptoms or are asymptomatic are contributing greatly to the spread of the virus…The new study suggests that two-thirds of the cases may be transmitted in this way, according to their mathematical…

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“…the W.H.O. and the C.D.C. told the public to wear masks if they were sick. However, there is increasing evidence of asymptomatic transmission, especially through younger people who have milder cases and don’t know they are sick but are still infectious. Since the W.H.O. and the C.D.C. do say that masks lessen the chances that…

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As the spread of the virus accelerates outside East Asia, some experts have called on global health authorities to rethink the role of masking. In an article published in the medical journal Lancet, a group of health researchers argued that the coronavirus has “defied conventional containment strategy” because patients at the early stages of infection…

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