New cases of Covid-19 shot up over 100 last week, surpassing August peak numbers and matching the infection rate of last April.

In their regular Monday update, the Island boards of health reported that 105 people had received positive PCR tests for the coronavirus during the week ending Saturday, Dec. 11. Another 21 were considered probably positive, based on over-the-counter test results.

In a subsequent email, the boards of health said 28 more people had tested positive on Sunday and Monday, following the seven days covered by the report.

Fifty-five of the 105 were people that were fully vaccinated, 37 were unvaccinated and the vaccination status of 13 was unknown, according to the report. No new clusters were reported.

Case numbers have been rising sharply for several weeks, and eclipsed a high of 97 cases recorded in the third week of August. The last time the Vineyard saw a week with more than 100 new cases was in early April.

Over the weekend, a special bus offering free vaccines and booster shots at the regional high school attracted a huge response, officials said.

Tisbury health agent Maura Valley said 1,215 vaccines and boosters were administered between Saturday and Sunday. She did not have a breakdown between first doses given to children and boosters received by adults.

Health officials hope to bring the bus back on Jan. 9, but have not yet decided whether it will be open to the general public or specifically geared to children who received their first shot this weekend, Ms. Valley said.

The Martha’s Vineyard Hospital continues to offer vaccines and boosters as well, but has been unable to meet a high demand on the Island.

Meanwhile, Chilmark and Oak Bluffs are among 102 towns statewide who will receive over-the-counter at-home rapid antigen tests starting next week. The state has purchased the iHealth Labs tests on behalf of towns that have a large proportion of families facing financial hardship.

According to a news release from the state office of health and human services, Chilmark will receive 180 tests and Oak Bluffs will receive 1,260. It will be up to the towns to determine how best to distribute these to people who need them most.