All of California is experiencing high community transmission: CDC

(KTLA) – 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 US counties are 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 10% or more positive cases Nucleic Acid Amplification Tests (NAAT) during the same period.

Currently, more than 99% of the United States has met or exceeded this threshold. This includes all 58 counties in California, as shown in 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 reported more than 735,000 new cases of COVID-19 in the past seven days. This equates to approximately 1,863 new cases per 100,000 people. Counties with the highest case rates over the past seven days include Los Angeles, San Diego and Inyo.

According to CDC guidelines, a county can only transition 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 hits of positive tests during the same period is between 8% and 9.99%.

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

The CDC recommends that anyone living in counties marked by high or substantial community transmission of COVID-19 wear a mask in public and indoor places. Earlier this month, Mandate for indoor masks in California has been extended for a month, until at least February 15, amid an increase in cases of the omicron variant of the coronavirus.

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