A comprehensive coronavirus testing program for about 100 residents and staff at the Windemere Nursing and Rehabilitation Facility has returned nearly perfect results, with zero positive tests, according to a press release Saturday from the Martha’s Vineyard Hospital. The hospital also confirmed that three nursing home residents had declined to be tested.

The Massachusetts National Guard tested 43 Windemere residents and 62 staff members on Thursday as part of a state Department of Public Health initiative to comprehensively test nursing homes throughout the commonwealth, which have been ravaged by the virus over the past two months.

Hospital officials announced the testing initiative at a press briefing two weeks ago, saying that they would test all residents and staff out of an “abundance of caution.”

Windemere has 46 residents, according to hospital spokesman Katrina Delgadillo. In followup conversations by phone with the Gazette Saturday, Ms. Delgadillo said the test was offered to all residents and three declined. To participate in the program, nursing homes, including Windemere, were required to meet a 90 per cent testing threshold for their residents and staff, Ms. Delgadillo said.

All 43 residents of Windemere who were tested for the virus received negative test results, according to the press release. Of the 62 staff members tested for the virus, 61 came back negative and one requires re-testing, the release said.

Ms. Delgadillo said the reason for the re-testing was a sampling error, and that a new test would be conducted soon. She also clarified later that all Windemere staff had agreed to be tested but that one staff member could not be on site at the time of the testing. That person will be tested when the re-test occurs, Ms. Delgadillo said.

In a statement, hospital president and chief executive officer Denise Schepici said the test results were the product of hard work by Windemere residents and staff, including the facility’s chief medical officer Dr. Ellen McMahon and nursing administrator Marie Zadeh.

“This is excellent news for the residents, their families, and our staff,” Ms. Schepici said in the statement.

Windemere, which is located on the hospital campus in Oak Bluffs, is the Island’s only skilled nursing facility.

The nursing home has been under a strict lockdown since late March, with visitors barred from entry and all staff screened before starting work. Residents, many of whom share rooms, have also received regular temperature checks, officials said at a prior press briefing.

No patients or staff at Windemere have tested positive for the virus since the outbreak began.