Vietnam has detected a Covid variant that appears to be a combination of the Indian and UK variants and can spread quickly by air, officials say.
Vietnam's Health Minister Nguyen Thanh Long described the latest mutation as "very dangerous".
Viruses mutate all the time and most variants are inconsequential, but some can make a virus more contagious.
Since Covid-19 was first identified in January 2020, thousands of mutations have been detected.
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