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The number of new coronavirus infections continued to rise Thursday across the greater Washington region as the average number of recent daily cases set a record.

Virginia, Maryland and D.C. added 8,617 new daily cases — the third-most in a single day since the start of the pandemic — sending the seven-day average soaring to 7,725. It’s the eighth consecutive day the recent average has risen across the region.

Compared with last week, the average of new daily cases is up 19 percent in D.C., 21 percent in Maryland and 29 percent in Virginia.

The increases have come as the distribution of vaccines continued across the region.

Virginia hospitals have administered more than 102,900 doses of the coronavirus vaccine in the three weeks since shipments of the Pfizer and Moderna vaccinations arrived in the state, according to the Virginia Hospital & Healthcare Association. Starting with the first shipments to Virginia in mid-December, the state’s 67 hospitals have received more than 269,000 doses, the association reported Thursday.

The Pfizer vaccine is administered in two doses 21 days apart, while the Moderna vaccine is given in two doses 28 days apart. Hospitals already have begun administering some of the 72,150 second doses of the Pfizer vaccine they received Dec. 31.

“It is important to understand that in addition to responding to the current COVID-19 surge, Virginia hospitals are also leading the way on a complex vaccination process that involves many moving pieces,” Virginia Hospital & Healthcare Association President and CEO Sean T. Connaughton said.

The process includes coordination of temperature-controlled shipment and delivery of the vaccine, storage in ultracold conditions, redistribution to other health-care facilities and scheduling vaccination clinics.

In Virginia, three groups are responsible for vaccinations. Hospitals give the vaccine to front-line clinicians at greatest risk of exposure before vaccinating other health-care professionals. CVS and Walgreens pharmacies are coordinating vaccinations for staff and residents of long-term care facilities. The Virginia Department of Health and local health districts, with help from hospitals, are overseeing vaccinations for other health professionals.

In Maryland, 98,536 people have received the first dose of the vaccine as of Thursday, according to the state’s vaccine distribution portal. In D.C., 16,989 vaccine doses have been administered. The city’s health department reports that 40,075 doses have been delivered to health-care providers.

D.C. reported 268 new infections Thursday, Maryland had 2,970 new cases and Virginia added 5,379. D.C. reported two new deaths, Virginia reported 49 and Maryland had 41.

The number of people hospitalized with the coronavirus ticked upward in D.C. and Virginia on Thursday, with 278 people hospitalized in the District and 3,000 in Virginia. Maryland had 1,834 people hospitalized Thursday, down slightly from 1,862 a day earlier.

The Washington suburbs continue to be among the hardest-hit jurisdictions in Maryland and Virginia — with Prince George’s County, by far, leading the state in the total number of reported coronavirus cases, including 3,190 in the past seven days. Montgomery County, the state’s most populous jurisdiction, has added 3,057 in the past seven days.

When adjusted for population, Prince George’s is third among Maryland jurisdictions in terms of cases per 100,000 residents, behind Alleghany and Somerset counties, while Montgomery County is 10th.

Fairfax County has reported the most cases in Virginia since the start of the pandemic, with 3,258 infections in the past seven days.