AstraZeneca vaccine: A game-changer against Covid - but question marks remain

It was the first vaccine administered anywhere in the world against Covid but this week AstraZeneca announced that it is withdrawing the product from markets worldwide. The decision comes days after it emerged that the pharmaceutical giant had admitted in legal documents that the jag "can, in very rare cases" cause Thrombosis with Thrombocytopenia Syndrome (TTS), a serious and potentially fatal blood clotting complication which had never been detected before.