Sonoma County Anticipates Drop in Positivity Rate After Changes to Tracking Methodology

Sonoma County is likely to see a recorded increase in coronavirus tests and a decrease in the local positivity rate as county health services alters the way it tracks coronavirus cases.

The change in methodology has been described as a “breakthrough” that should bring Sonoma’s numbers more in line with the state’s, according to reporting from Patch.

Under the county’s previous methodology, the numbers, as of last week, stood at 13 cases and 11.5 percent respectively.

Under the county’s new data, which more closely aligns with numbers from the California Department of Public Health, the county’s seven-day average case rate per 100,000 residents was 11.2 while its seven-day average positivity rate was 5.3 percent.

"This change should clear up the confusion about discrepancies about the State’s numbers and the County’s numbers, leaving us in a better place moving forward," said Dr. Sundari Mase, Sonoma County's health officer.

"But it’s important to note that these updates would not have resulted in any change to the COVID-19 policy decisions made previously regarding our County," Mase said. "It’s the State’s numbers, not the local ones, that determined whether Sonoma County was on the watchlist and, later, where we would be grouped under the governor’s new four-tier plan."

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