A study of side effects following vaccination with AstraZeneca's anti-Covid-19 shot in Scotland found only an association with a largely harmless bleeding condition and no link to brain clots, underscoring the rarity of potential complications.

A group of researchers led by University of Edinburgh Professor Aziz Sheikh, who tracked the health of 5.4 million people in Scotland, found that about one additional case of idiopathic thrombocytopenic purpura (ITP) per 100,000 people...