Cases of Covid-19 crept up slightly on the Vineyard last week, as public health officials keep a close eye on the numbers with new sub-variants of the virus emerging around the globe.

Martha’s Vineyard remains classified as low risk for Covid, using the Center for Disease Control metrics, which are based on PCR positive cases and the number of hospitalizations in the community. If over-the-counter (OTC) tests were included in the metrics, the Vineyard would be classified as medium risk, Tisbury health agent Maura Valley said in her weekly report that went out Monday from the Island boards of health.

When a community is in the medium risk category, the CDC recommends that individuals at high risk for severe illness speak with their health care provider about whether they should wear a mask and take other precautions.

In the Monday report, 58 positive cases were recorded for the Island between March 13 and March 19. Of those cases, 18 were from PCR tests, and 40 were reported from OTC or antigen tests.

Among the reported cases, 26 patients had been vaccinated with booster shots, 17 had completed a first vaccination series, one was partially vaccinated, 10 were unvaccinated and four were unknown.

From Monday through Wednesday this week, 30 more cases were reported by the boards of health.

No one has been hospitalized with the virus throughout the most recent reporting period.