The virus that triggers COVID-19 has had many variants of concern. Vaccines currently being deployed help prevent severe infection but with Omicron there have been many breakthrough cases, even among people who’ve been boosted. 

The U.S. is now working on a so-called “pan coronavirus” vaccine that it hopes would provide protection from all coronaviruses, including the multiple variants that cause COVID-19. 

Karina Huber reports.

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