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Though the Delta variant of COVID-19 is often pegged as the catalyst for the most recent wave of the virus, a less common variant known as Mu was discovered in western Kentucky during genome sequencing of tests not long after, a public health official with the Purchase District Health Department (PDHD) said.
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With older adults vaccinated, doctors say a growing share of their COVID-19 patients are in their 20s, 30s, 40s and 50s, as more contagious variants circulate among people who are still unvaccinated.
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The B.1.1.7 variant is now the most dominant version of the coronavirus in the U.S.
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The variant known as B.1.1.7, which is more easily spread, was first identified in England last fall. Since then, it has spread quickly in the U.S.