http://www.sciencemag.org/news/2021/04/concerns-over-rare-clotting-disorders-halt-use-johnson-johnson-s-covid-19-vaccine

A nurse fills a syringe with the Johnson & Johnson COVID-19 vaccine at a pop-up vaccination site in New York City on 8 April.

Science’s COVID-19 reporting is supported by the Heising-Simons Foundation.