Scientists are trying to understand why the omicron variant of COVID-19 is spreading so fast. They already know that omicron can infect vaccinated people, which is a big advantage for the virus. What researchers have also discovered is that omicron multiplies much faster than delta, a previous variant, and infects cells higher in the respiratory tract. Listen to learn how these and other adaptations make omicron a more contagious, although not necessarily more deadly, virus.
Story Length: 4:00
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