A COVID-19 warning on display at the Nantucket Steamship Authority terminal on April 25, 2020 in Nantucket, Massachusetts. (Maddie Meyer/Getty Images) Leaders in Martha's Vineyard and Nantucket are worried the islands don't have enough vaccine for residents, especially with the population expected to swell this summer. Cape Cod officials are encouraged by the region's progress toward vaccinating its most vulnerable populations, but with eligibility now open to all adults, they worry that the islands will fall behind. Martha's Vineyard and Nantucket are more reliant on the stream of doses the Baker administration allocates, with neither island home to a retail pharmacy in the federal vaccination program and every mass vaccination site a ferry ride and a drive away.