Covid-19: Omicron subvariant BA.2 is gaining ground. Should we worry?

Two years into the pandemic, a mutated version of the omicron variant, known as BA.2, has become the latest challenge to taming Covid-19.

The subvariant, detected in at least 57 countries, appears to spread even more easily than the original. But so far it doesn’t seem to cause more severe disease and booster shots remain an…

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