Health

Delta defeats other variants as scientists race to understand its tricks

Since late last year, the country has been overrun by a succession of coronavirus variants, each with its own suite of mutations conferring slightly different viral traits. For much of this year, the alpha variant — officially known as B.1.1.7 and first seen in the United Kingdom — looked like the clear winner, accounting for the majority of cases by April. In second place was iota, B.1.526, first seen in New York City. A few others made the rogue’s gallery of variants: gamma, beta, epsilon.


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