The Island boards of health reported six new cases of Covid-19 on Monday and said they were investigating a cluster of cases stemming from a private event held on Oct. 11.

“This spike in cases should remind us all of the importance of wearing masks, practicing social distancing and avoiding large gatherings whenever possible,” health officials said in an afternoon email update.

Three of the cases were people that tested positive at Martha’s Vineyard Hospital, and one was hospitalized.

Hospital spokesman Marissa Lefebvre said in an email Monday morning that all three patients received positive tests over the weekend, with one testing positive on Saturday and the other two testing positive on Sunday. The patient was admitted to the hospital on Sunday. Updated case counts for the Island are not released over the weekend.

The hospitalized patient is in “fair condition,” Ms. Lefebvre wrote. The hospital classifies patient condition as good, fair, serious or critical.

Four people tested positive at TestMV, the comprehensive testing site at the high school, but health officials said one was among those that had tested positive at the hospital.

The six new cases are in addition to two cases reported on Friday. The cases reported on Monday include three women and three men, according to data provided by the boards of health.

The uptick in cases on the Vineyard comes as a spike in cases continues statewide.

In its daily report, the boards of health said 54 people have now tested positive for the virus at the hospital of the 5,983 tests administered. There are currently seven tests pending.

TestMV has administered 17,950 tests of which 42 have been positive for Covid-19. There are 525 tests pending. TestMV offers testing for people who are asymptomatic.

The hospital admitted its first Covid-positive inpatient on Oct. 7. The patient was discharged in two days later on Oct. 9 in good condition.

At least two other Covid-19 patients have been treated at the hospital emergency room before being transferred off-Island to Boston. Both transfers occurred in either late March or early April, just as the pandemic began to peak in the Northeast.

There were no Covid-19 hospitalizations reported on the Island over the summer.

Meanwhile, new case numbers statewide eclipsed 1,000 on Sunday and have hovered around that number over the weekend, marking the first time since early May that the state Department of Public Health reported daily case totals in the thousands.

The state has 553 patients hospitalized for the virus, and a seven-day average positive test rate of 1.5 per cent. The numbers have been steadily climbing in past weeks from lows in September.

The DPH has now recorded more than 147,000 cases of coronavirus statewide, and 9,640 deaths. No Covid-19 related deaths have been reported on Martha’s Vineyard.