Public health activists who have been tracking adverse events following immunisation (AEFI) in the ongoing covid vaccination effort have repeatedly sought greater transparency in AEFI investigations and more rapid causality assessments to help inform vaccination policy. After initial denial, the European Union and the UK medicine regulators, following detailed investigation, have concluded that there is a possible link between some blood clotting events with low platelets and the Oxford-Astra Zeneca vaccine and have asked for these to be listed as “extremely rare potential side-effects”....