LONDON – The EMA has concluded that the rare cases of serious blood clots with low platelet counts seen after administration of Astrazeneca plc’s COVID-19 vaccine are caused by the vaccine, but said the benefits of its use continue to outweigh the risks. The possibility of cerebral venous sinus thrombosis and splanchnic vein thrombosis in the abdomen will now be listed as rare side effects and the EMA’s guidance to health care professionals will be updated.