Every California county is at the highest COVID transmission rate: CDC

Pedestrians wear masks as they walk past a sign reminding the public to take action to stop the spread of the coronavirus on July 23, 2020, in Glendale, Calif. (AP Photo / Chris Pizzello, File)

COVID-19 cases are on the rise in the United States, with an increase even more apparent in the latest data from the Centers for Disease Control and Prevention.

As of Thursday, all but 19 counties in the United States were experiencing high community transmission of COVID-19. A high transmission rate means a county has reported 100 or more new cases of COVID-19 per 100,000 people in the past seven days, or has recorded 10% or more of nucleic acid amplification testing (NAAT) positive during the same period.

Currently, over 99% of the United States has met or exceeded this threshold. This includes all 58 counties in California, as shown on the CDC map below.

Level of community transmission of COVID-19 in California as of January 13, 2021 (Centers for Disease Control and Prevention)

The latest CDC data shows California has reported more than 735,000 new cases of COVID-19 in the past seven days. This equates to about 1,863 new cases per 100,000 people. The counties with the highest case rates in the past seven days include Los Angeles, San Diego and Inyo.

According to CDC guidelines, a county can only switch from high community transmission to substantial community transmission when new cases per 100,000 in the past seven days drop to between 50 and 99.99, or the percentage of results positive test results during the same period is between 8% and 9.99%.

The closest county to reaching that threshold is Trinity County, which has a seven-day case rate of 203.50 per 100,000 people.

The CDC recommends that everyone who lives in counties with high or substantial community transmission of COVID-19 wear a mask in public and indoor places. Earlier this month, California’s indoor mask tenure was extended for a month, until at least February 15, amid rising cases of the omicron variant of the coronavirus.

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