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The death toll from confirmed cases of the coronavirus in Massachusetts rose by 18 to 8,488, state officials reported Friday, and the number of cases climbed by 320, bringing the total to 111,853.

The state also reported 97 new probable coronavirus cases, bringing the total of positive cases to 8,438. No new probable-case deaths were reported, leaving that total at 221.

An additional 14,740 new individuals were tested for the virus, the state Department of Public Health reported, bringing the total to 1,277,617 individuals. The total number of tests conducted rose to 1,676,170. Also, 615 new individuals received the coronavirus antibody test, bringing that total to 100,383.

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Four key metrics that the state is using to monitor the reopening remained low, relative to the April surge.

The seven-day weighted average of positive tests dropped to 1.9 percent as of Thursday, down from 2.1 percent the day before. That’s down 93 percent from mid-April highs. But officials have said they are concerned about recent upticks in the number, and Governor Charlie Baker on Friday announced steps to clamp down on the virus.

The three-day average of hospitalized coronavirus patients rose again, to 396 Thursday, up from 384 the day before. That still represents an 89 percent drop from April 15.

The number of hospitals using surge capacity remained steady at four for the third straight day, and was down 81 percent from mid-April.

The three-day average of coronavirus deaths among confirmed cases dropped to 11 as of Tuesday, down from 13 the day before. That represents a 93 percent drop from April 15.

The numbers were released just hours after Baker announced that he would take a series of measures to slow the state’s reopening and restrict gathering sizes.

“In the past few weeks, we have seen an uptick in COVID-19 in some communities here in the Commonwealth. There have been several reports of big parties, in places like Falmouth, Chatham, Winthrop, Wrentham, and Cohasset, to simply name a few,” Baker said Friday at a press conference. “There have also been reports about illegal sports camps and private boat charters, where clusters of new cases have quickly developed.”

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Meanwhile, a closely watched model predicts that the death toll from the coronavirus pandemic in Massachusetts could rise to about 10,000 by Dec. 1.

The model from the University of Washington Institute for Health Metrics and Evaluation predicts 10,314 deaths by that time, though it also said the numbers could range from 9,486 to 12,292.

The IHME modelers were advancing their forecast by a month. Previously, they had been projecting around 9,647 coronavirus deaths in Massachusetts by Nov. 1.

A University of Massachusetts model released earlier this week looked four weeks ahead and estimated that the Massachusetts coronavirus death toll will rise over 9,000 by Aug. 29.

A new model created by researchers from Google Cloud collaborating with Harvard looked only two weeks ahead and predicted the state’s death tally will rise to 8,880 by Aug. 17.

The IHME model also painted a grim picture of the national toll of the coronavirus pandemic, saying the death count could rise to 295,000 by Dec. 1.

The IHME modelers said the surge of infections appeared to be easing in Florida, Texas, California, and Arizona, but deaths are expected to rise for another week before leveling off.

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“The peaking of transmission in these states appears to be driven by the combination of local mandates for mask use, and bar and restaurant closures, along with more cautious behaviors from the public,” the IHME modelers said in an online posting.

The IHME modelers also warned of new hot spots, saying, “transmission of COVID-19 is increasing in 11 states: Colorado, Idaho, Kansas, Kentucky, Mississippi, Missouri, Ohio, Oklahoma, Oregon, Virginia, and Wisconsin. These states may experience increasing cases for several weeks. We hope to see a behavioral response toward more cautious behavior in these states soon.”

Dr. Deborah Birx, the White House coronavirus response coordinator, warned this week that Boston is one of several major US cities seeing an increase in COVID-19 cases.

Travis Andersen of the Globe staff contributed to this report.


Christina Prignano can be reached at christina.prignano@globe.com. Follow her on Twitter @cprignano. Martin finucane can be reached at martin.finucane@globe.com.