Halton to accept vaccine appointments for essential workers, high-risk 18+ group on April 16 by Lucas Casaletto Posted Apr 9, 2021 3:00 pm EDT FILE - In this March 31, 2021, file photo, a nurse fills a syringe with a dose of Johnson & Johnson's COVID-19 vaccine in Uniondale, N.Y. Roughly half the country has opened up vaccine eligibility beyond initial restrictions, vastly expanding the ability for most Americans to get a shot in the arm despite their age or any pre-existing medical conditions. But inside prisons, it’s a different story — prisoners, not free to seek out vaccines, still on the whole lack access. (AP Photo/Mary Altaffer, File)