The health authorities are looking into whether a thrombosis case in Malta is linked in any way to COVID vaccination.
In a statement late on Wednesday, the Health Ministry said it has been informed of a 58-year-old person who suffered thrombosis two weeks after receiving the first dose.
The ministry did not specify the brand of the administered vaccine.
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The person is in a stable condition, it reassured, adding that the Malta Medicines' Authority is looking into the matter.
Earlier this month the European Medicines Authority said blood clots were a "very rare" side effect of the AstraZeneca jab and the benefits outweighed the risks.