Joseph Rose, 66, of Portsmouth, says he was unaware when he signed up for a vaccine that Clinica Esperanza's mission is to serve the hardest-hit neighborhoods. (Gretchen Ertl for The Public's Radio) Inside a storefront health clinic in a Price Rite shopping plaza in Providence, the regulars are mostly immigrants who speak Spanish, Portuguese and Creole. They work cleaning offices, washing cars and fileting fish in grocery stores. And nearly one in four of the patients last month tested positive for the coronavirus, said Dr. Annie De Groot, the volunteer medical director at the nonprofit Clinica Esperanza, or Hope Clinic. “A lot of our patients have been waiting for the vaccine and dying before they got the vaccine,’’ De Groot said. “So we kind of would like to be able to vaccinate our population.”