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Coronavirus Information Center

Tiny particles that people expel when they sneeze, cough or talk are getting a close look for their ability to spread the new coronavirus. They come in a range of sizes, and while public health advice was originally based on larger particles, the focus has shifted to risk from smaller ones. These “aerosols” may explain how a single person can infect many others at a time in an enclosed area. While questions remain about their significance, some scientists say the time to take protective measures is now.