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variants

Francesco Zorzi

Delta and omicron met up inside 1 person and made the Frankenstein hybrid 'deltacron'

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A colorized electron microscope image from the National Institute of Allergy and Infectious Diseases shows a single human immunodeficiency virus budding from a human immune cell. AP hide caption

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AP

A computer-generated image of the omicron variant of the coronavirus. Uma Shankar Sharma/Getty Images hide caption

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Uma Shankar Sharma/Getty Images

A second version of omicron is spreading. Here's why scientists are on alert

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People line up to get on an Air France flight to Paris at OR Tambo's airport in Johannesburg, South Africa, on Friday as several countries announced travel bans in response to the omicron variant of the coronavirus. Jerome Delay/AP hide caption

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Jerome Delay/AP

A sign urges people to get tested for a COVID-19 variant in Blackburn, England. The U.K. is experiencing a surge in the delta variant, which was first identified in India. Oli Scarff/AFP via Getty Images hide caption

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Oli Scarff/AFP via Getty Images

Coronavirus FAQ: I've Been Vaccinated. Do I Need To Worry About Variants?

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The World Health Organization says it will start assigning new names for variants of the coronavirus based on letters from the Greek alphabet — part of an effort to help avoid stigmatization around the virus. Fabrice Coffrini/AFP via Getty Images hide caption

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Fabrice Coffrini/AFP via Getty Images

A scientist works on COVID-19 samples to find variations of the virus at the Croix-Rousse Hospital laboratory in Lyon, France, in January. Jeff Pachoud/AFP via Getty Images hide caption

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Jeff Pachoud/AFP via Getty Images

Can Vaccines Stop Variants? Here's What We Know So Far

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