Massachusetts reported 78 new confirmed coronavirus cases Thursday, as the seven-day average ticked down to 61 from 62 the day before.
The new cases brought the pandemic total to 663,478. The state also reported four new confirmed coronavirus deaths, bringing the state’s total to 17,622.
Another 16,636 coronavirus shots were administered, the Department of Public Health said.
Experts and officials say the protection from millions of vaccinations is kicking in, and the pandemic has subsided after more than a year of wracking the state.
New data showed that — for the fourth straight week — none of the state’s 351 cities and towns is considered high-risk for the virus.
The DPH said 1,636 people were estimated to have active cases of the potentially deadly virus, and 96 confirmed coronavirus patients were in the hospital.
The DPH also reported that 32,769 more tests had been conducted for coronavirus. The total number of tests administered climbed to more than 23.67 million.
The seven-day average rate of positive tests, calculated from the total number of tests administered, was at 0.32 percent.
The department said the rate would be 0.42 percent if the effect of college testing programs — in which asymptomatic people can be tested repeatedly in an effort to rapidly identify new cases — is factored out.
The number of new vaccinations Thursday was greater than on Wednesday, when 15,907 were reported. The new vaccinations brought the total to 8,505,005.
The total number of shots administered amounted to around 89 percent of the 9,555,100 doses shipped to providers in the state so far, the Department of Public Health said.
The total shots administered included 4,379,685 first shots and 3,853,111 second shots of the Moderna and Pfizer two-shot vaccines. It also included 272,209 shots of the Johnson & Johnson one-shot vaccine.
The number of people fully vaccinated — with either two shots of the Moderna or Pfizer vaccines or one shot of the Johnson & Johnson — rose to 4,125,320.
Peter Bailey-Wells of the Globe staff and correspondent Jeremy C. Fox contributed to this report.
Martin Finucane can be reached at firstname.lastname@example.org.