Chautauqua County set a new single-day high in COVID-19 cases — and its largest city now has 100 active cases.

According to data released Friday that reflects Thursday’s numbers, 110 new cases were identified. The previous high was 90 new cases, which was recorded Dec. 4.

There are currently 441 active cases of the virus countywide, an increase of 62 cases from Thursday.

The number of people in the hospital with COVID-19 also increased, from 20 reported Thursday to 23 on Friday.

To date, 2,303 confirmed cases of the virus have been reported by the county Health Department in addition to 22

deaths, 1,840 recoveries and a 6.3% seven-day positivity rate.

Of the new cases reported, 28 involve people living in the Jamestown zip code and 27 in the Mayville zip code. Jamestown now has 100 active cases, a net increase of nine.

On Thursday, Chautauqua County Sheriff James Quattrone said 27 inmates were confirmed to have COVID-19 after 126 were tested this week at the jail. He said 33 staff were tested, with three coming back positive.

The sheriff said inmates tested this week were ones placed in quarantine and considered close contacts for those who tested positive for COVID-19 last week. The same inmates had tested negative during the first round of testing when the outbreak was first discovered.

“We are continuing to work with the State Commission of Corrections, County Health Department, and our medical directors,” Quattrone said in a message to the OBSERVER and The Post-Journal.

It was also an unfortunate record-setting day in Cattaraugus County. The Health Department announced 91 new cases with 575 active. Total cases are 1,670 with 1,063 recovered. Twenty-six residents were reported hospitalized.

State contact tracing data does show that roughly 74% of the recent surge of COVID-19 has come from household and social gatherings.

Gov. Andrew Cuomo released that data during a press conference on Friday, noting that the state found 46,000 data points. Of that data, 73.84% shows that private household gatherings are driving the spread.

Christine Schuyler, county public health director, discussed a wide range of coronavirus-related topics during November’s meeting of the county Board of Health, emphasizing “family spread” as the cause of a recent surge in coronavirus cases.

“What we have seen, just from case investigations, really seems to be family spread,” Schuyler said. “We have a lot of family members spreading it amongst themselves. We got a couple weddings where it has gone through large portions of the families on both sides and friends. We’ve had Tanglewood Manor. So it really seems to be community spread; we haven’t seen spread within schools, which is really good.”

The governor also set new metrics for micro-cluster zones on Friday and that state officials will calculate the data over the weekend and announce new yellow, orange and red zones on Monday to help stop the spread of COVID-19.

“Some of the states have had a full-open, full-close… I think that’s highly destructive,” Cuomo said. “Our approach has been different. It’s been following the data and metrics.”

To enter a red zone, a region has to have its data trend toward 90% capacity in the next 21 days. An orange zone has to see a 4% positivity over the last 10 days or hit 85% hospital capacity in the next three weeks. A yellow zone threshold is reached when a region has a 3% infection rate over 10 days and the cluster is in the top 10% for hospital admissions per capita.

Health officials reported Friday that Chautauqua County’s infection rate over the last seven days was 6.3%.