BA.2.75 (Centaurus) is still a subvariant worth watching

BA.2.75, a newer subvariant that evolved from BA.2, has been driving increased coronavirus transmission in some other countries recently. This lineage has yet to be identified in large numbers in the U.S., but I was inspired by a recent reader question to share what we’ve learned about it since my previous post in July.

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National numbers, September 11

It might appear that the U.S. reported a significant drop in COVID-19 cases last week, as the CDC’s numbers dropped to about 70,000 new cases a day last week from 87,000 new cases a day in the prior week. But in fact, the decline was likely exaggerated by Labor Day weekend, as testing labs and the public health workers who crunch data took time off.

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National numbers, September 4

Over the past month, COVID-19 trends in the U.S. have been fairly consistent: disease spread has declined slowly around the country. Official case counts dropped from about 120,000 a day in the first week of August, to about 80,000 a day last week.

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