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Articles on Coronavirus vaccines

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Researchers are working to develop vaccines that provide long-term immune protection from COVID-19. Marko Geber/Digital Vision via Getty Images

How long does protective immunity against COVID-19 last after infection or vaccination? Two immunologists explain

Because COVID-19 is a relatively new virus, researchers still aren’t sure exactly how long vaccines and prior infections provide protection.
In the U.S., people were placed into four groups for vaccine access. AP Photo/Lynne Sladky

US vaccine rollout was close to optimal at reducing deaths and infections, according to a model comparing 17.5 million alternative approaches

With limited vaccines available in early 2021, the CDC had to decide which people received vaccines first. With the help of a supercomputer, researchers have shown that the CDC did an excellent job.

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