CDC Announces New Metrics For Omicron Variant

The US Centers for Disease Control and Prevention will announce new metrics to guide Covid-19 restrictions such as mask-wearing as early as Friday or possibly in the early part of next week, according to a CDC scientist directly involved with the process and a senior federal official.

The CDC currently says that people who live in counties with substantial or high levels of Covid-19 transmission should wear masks indoors.

The agency will not be changing that guidance but will be changing the way it assesses “community levels of disease,” by shifting from looking at cases alone to looking at “meaningful consequences” of the virus such as hospitalizations, emergency room visits and deaths.

In the current map, 97% of counties are at substantial or high transmission. The scientist said the updated metrics will result in fewer counties at the highest levels of transmission.

“CDC is moving from looking at community transmission as an indicator to monitoring levels of Covid-19 in communities by looking at hospital capacity, hospitalizations and cases,” the federal official said.

Guidance about different mitigation measures, such as masking and social distancing, will be based on the levels of disease in an individual county.

“There will be consideration that when you get to this level, you’ll want to consider doing this” the CDC scientist said.

“Hopefully they’ll be stressing the importance of local health departments making decisions according to local circumstances.”

The scientist said they’ve seen various versions of the new metrics but not the most recent version.

The current community transmission map is based on the number of new cases per 100,000 people and the percent of positive tests in the past seven days.

The agency will change this metric for two reasons, the source said. One, many more Americans are vaccinated now. Two, Omicron, the dominant variant in the United States, is much more transmissible and causes much milder illness.

The decision to use case numbers was made earlier in the pandemic, based on the behavior of previous variants.

But the now-dominant Omicron variant acts differently than previous variants, so the federal official said it makes sense to tweak the metrics based on those differences.

The scientist said the CDC now wants to focus more on meaningful consequences such as hospitalizations, emergency room visits and deaths, noting that this is similar to the way the agency monitors influenza. continue reading

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