Several European nations have temporarily suspended the administration of the Oxford-AstraZeneca COVID-19 vaccine following reports of blood clotting in some patients.

Doses of the AstraZeneca Covid-19 vaccine are stored at the Foch hospital in Suresnes, on February 6, 2021, on the start of a vaccination campaign for health workers with the AstraZeneca/Oxford vaccine. – The top French medical authority Haute autorité de Santé has approved the vaccine for use in France, but only for people under 65, echoing decisions made in Sweden, Germany, Belgium and Switzerland over concerns about a lack of data on the effectiveness of the vaccine for over 65s. (Photo by Alain JOCARD / AFP) (Photo by ALAIN JOCARD/AFP via Getty Images)