California Covid Positivity Increase Steepens As Newsom Warns Of Winter Surge

“This time last year,” observed California Governor Gavin Newsom on Thursday, “we had about 4,000 cases. One month later we had 18,000 cases. One month after that, we had 54,000.

“Basically,” the state saw “a tripling of cases,” he said.

Newsom meant the reminder as a warning.

“What’s going on in the U.K. right now?” he asked rhetorically. (Answer: The case rate in England hit its highest level since the start of the year, according to Britain’s Office for National Statistics.)

Newsom then observed that case trends in the U.K. are often about “a month or so ahead” of those in California. Experts have also warned that any increase in the state will be starting from a higher floor. While it saw 4,857 new cases exactly one year ago, there were 7,089 reported today.

Furthermore, the state’s 7-day average Covid test positivity rate has begun to increase for the first time in months. The test positivity rate is one of the most trusted measures of infection spread because, being a 7-day rolling average, it factors out jumps or slowdowns in testing that can impact raw case numbers. It also to smooths out most increases or dips due to backlogs in test results.

California’s test positivity rose over 25% in the week-and-a-half before Newsom made that statement. It increased from a post-summer low of 1.9% last Friday to 2.5% on Thursday. That was up from 2.2% on Wednesday of this week, according to the San Francisco Chronicle.

Today, the increase steepened, with the state reporting a test positivity rate of 2.8%. It’s only one additional day of data, but it represents quite a jump given that test positivity had taken 10 days to rise .6% and, in just the last two days, it has now risen the same amount. That worrisome to those who remember the bad old days of the winter 2020 surge, which began to take off right around the end of October.

Another of the most trusted measures of disease spread, the 7-day average of cases per 100,000 residents, has also begun to rise. On Monday, it was 11.3. Today, it is 12.2.

“We’ve been tracking this data very closely,” said Newsom on Thursday.

“We’ve got to be mindful of the winter months and safely enjoying the holidays together,” he continued. “I know how hard it’s been. We’ll get through this.”

The bright side is that, even as the case rate begins to rise, booster shots are available to millions of Californians and, possibly as soon as next week, 3.5 million residents ages 5-11 may become eligible for their first coronavirus vaccinations. The hope is that the additional vaccinations among those populations may mitigate a winter surge.

As Newsom himself tweeted on Tuesday, “Winter is coming. Get your booster.”

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