http://www.sciencemag.org/news/2021/02/south-africa-suspends-use-astrazenecas-covid-19-vaccine-after-it-fails-clearly-stop

A participant in the South African trial of the AstraZeneca-Oxford COVID-19 vaccine has blood drawn before receiving her second dose.

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