ASTRAZENECA's Covid vaccine has been linked to a 30-percent higher risk of getting a very rare blood clotting condition compared to the Pfizer jab, a large international study said Thursday.

Several countries have already altered their advice after previous research indicated that — in a tiny number of cases — thrombosis with thrombocytopenia syndrome can be a possible side effect of Covid vaccines that use an adenovirus vector, or "engineered" virus, such as those from AstraZeneca and Johnson & Johnson.

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