A new Covid-19 variant , called XFG or “ Stratus ,” is making waves in the United States. The strain has quickly overtaken the previous dominant variant, NB.1.8.1 (also called Nimbus), and is spreading just as the US enters the fall respiratory virus season, a time when flu, RSV, and common cold cases usually rise.

Stratus is spreading fast

According to the Centers for Disease Control and Prevention (CDC), overall Covid activity in the US is currently ‘moderate.’ But 19 states, including Nevada, Utah, Connecticut, and Delaware, are seeing ‘high’ or ‘very high’ levels of the virus. Stratus is a hybrid of two Omicron sub-variants and was first detected in Southeast Asia in January before reaching the US this spring. By June, it had been reported in 38 countries, prompting the World Hea

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