Britain's MHRA medicine regulator is considering precautionary advice for people with a history of capillary leak syndrome but does not see a causal link with AstraZeneca's COVID-19 vaccine after the EU said it was a rare side effect of the shot. MHRA Chief Executive June Raine said that two of eight reports of capillary leak syndrome following AstraZeneca vaccination were in people with a history of the condition, and 40 million doses of the vaccine had been given.