Recent revelations by pharmaceutical company AstraZeneca have brought Covid vaccines back into the spotlight, with acknowledgment that its AstraZeneca-Oxford vaccine can, in very rare instances, lead to Thrombosis Thrombocytopenia Syndrome (TTS)," a condition involving the formation of blood clots in blood vessels. Despite these rare occurrences, the pharmaceutical firm maintains that extensive clinical trial data and real-world evidence consistently support the safety and effectiveness of the vaccine.