BF.7, yet another Omicron subvariant of concern

Omicron BF.7, an offshoot of BA.5, is the latest subvariant to raise red flags among experts tracking COVID-19 in the U.S. This week, BF.7 passed BA.2.75, another worrying lineage, in the CDC’s prevalence estimates: the CDC found that it caused about 2.3% of new cases nationwide in the week ending September 24.

Read More

National numbers, September 18

Officially-reported COVID-19 cases are still on the decline nationwide this week, as are newly hospitalized patients (a more reliable metric). About 4,400 people with COVID-19 were admitted to hospitals across the country, compared to over 6,000 a day in late July. But wastewater data are suggesting a potential new surge.

Read More

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.

Read More

National numbers, July 3

BA.4 and BA.5 are now the dominant coronavirus lineages in the U.S., and they’re reviving our recent surge: from the plateau of recent weeks, national COVID-19 cases are clearly going up again. Reported cases rose 11% last week from the week prior. And, as always, this number is a significant undercount of true infections.

Read More

FAQ: BA.4 and BA.5, potentially the most transmissible Omicron subvariants yet

America’s current COVID-19 surge is being driven by BA.2 and its sublineage BA.2.12.1. But there are other versions of Omicron out there to which we need to pay attention—namely, BA.4 and BA.5. Here’s a brief FAQ on these two subvariants, including why scientists are concerned about them and where they’re spreading in the U.S.

Read More

How one wastewater plant became a leading COVID-19 forecasting source

This week, I had a new story published with FiveThirtyEight and the Documenting COVID-19 project about the data and implementation challenges of wastewater surveillance. As bonus material in today’s COVID-19 Data Dispatch, I wanted to share one of the interviews I did for the story, which provides a good case study of the benefits and challenges of COVID-19 surveillance in wastewater.

Read More