A colorized electron micrograph image of a cell (red) infected with with SARS-CoV-2 virus particles (yellow), isolated from a patient sample. Science Source hide caption
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A colorized scanning-electron-microscope image shows SARS-CoV-2 (the round blue objects) emerging from cells cultured in the lab. SARS-CoV-2 is the coronavirus that causes the disease COVID-19. NIAID-RML/Science Source hide caption
A man receives a dose of a COVID-19 vaccine in Soweto, South Africa. The omicron variant of the coronavirus, first identified in South Africa, has now spread to at least a dozen other countries. On Friday, scientists presented evidence that the variant spreads twice as fast as the delta variant. Denis Farrell/AP hide caption