Two health care workers prepare syringes with AstraZeneca’s COVID-19 vaccine in London Monday. A U.K. study will expose volunteers to the coronavirus and could help development of future vaccines.

LONDON, ENGLAND – MARCH 08: Dental hygienist and Covid vaccinator, Petra Moinar (L), and nurse Damyantee Chutoorgoon (R) prepare syringes with the AstraZeneca vaccine before it is administered at Battersea Arts Centre on March 8, 2021 in London, England. The site opened today for residents of the London Borough of Wandsworth to receive their covid-19 vaccine. To mark the initiative, Battersea Arts Centre commissioned artists including Inua Ellams, Scottee & Friends, Rosie Jones and coletivA ocupação to create works that provide a “welcoming and creative digital experience for visitors.” (Photo by Chris J Ratcliffe/Getty Images)