ATAGI advised on 25th March 2021 that there was a potential safety concern being investigated overseas, involving cases of thrombosis (blood clots) and thrombocytopenia (low blood platelet count) occurring after COVID-19 Vaccine AstraZeneca.
On 2 April 2021 ATAGI reported that a probable case had been reported in an Australian vaccine recipient, and issued an updated advice for healthcare providers.
This ‘thrombosis with thrombocytopenia syndrome’ (TTS) is a newly described serious condition, with unusual blood clots in the brain (cerebral venous sinus thrombosis) or in other parts of the body, associated with low platelet levels.