AstraZeneca

Fact-check: Does AstraZeneca Vaccination Years Ago Still Pose a Risk of Blood Clots?

Investigations by several medical organizations indicate that Thrombosis with Thrombocytopenia Syndrome (TTS) is a very rare adverse event associated with the AstraZeneca vaccine. Symptoms typically develop within 4–30 days after vaccination. Healthcare professionals are therefore advised to monitor for the condition and conduct prompt screening when relevant symptoms occur. The World Health Organization (WHO) has also stated that during the period of active COVID-19 transmission, the benefits of vaccination in preventing severe disease substantially outweighed the risks associated with TTS.

Aug 25, 2026