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Thrombosis and Thrombocytopenia Syndrome

  • Context (IE): AstraZeneca has withdrawn its Covid vaccine from the global market.
  • Reason Stated for the withdrawal: There is a surplus of updated vaccines targeting new virus variants.
  • Studies reveal rare side effects like thrombosis and thrombocytopenia Syndrome (TTS) associated with the AstraZeneca vaccine.

Thrombosis

Thrombosis - PMF IAS

Credit: Cleveland Clinic

  • It happens when blood clots obstruct blood vessels, and there are two primary types.
  • Venous thrombosis: This occurs when a blood clot blocks a vein.
    • Veins transport blood from the body back to the heart.
  • Arterial thrombosis: This occurs when a blood clot obstructs an artery.
    • Artery carries oxygen-rich blood away from the heart to the body.

Thrombocytopenia Syndrome (TTS)

  • It occurs when a person has blood clots together with a low platelet count (thrombocytopenia).
  • Symptoms occurred between 4 and 42 days after vaccination with the AstraZeneca vaccine.
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