What is Thrombosis Thrombocytopenia Syndrome (TTS)?

Thrombosis Thrombocytopenia Syndrome (TTS) is characterized by blood clots (thrombosis) combined with low levels of platelets (thrombocytopenia), which are necessary for blood clotting.

It often involves unusual blood clot locations, such as in the brain (cerebral venous sinus thrombosis) or abdomen.

TTS is a rare but serious condition associated with certain COVID-19 vaccines, particularly adenovirus vector vaccines like AstraZeneca and Johnson & Johnson's Janssen vaccine.

AstraZeneca, the pharmaceutical giant, has acknowledged that its COVID-19 vaccine can lead to a rare side effect called Thrombosis with Thrombocytopenia Syndrome (TTS).

The Oxford–AstraZeneca COVID vaccine was marketed worldwide under various brand names, including Covishield and Vaxzevria.