- This event has passed.
Immune System Day
March 11
Immune System Day is celebrated on March 11, 2026. A fun excuse to learn something new or gather your favorite people.
Photo: SGUL lymres via Wikimedia Commons.
Immune System Day is celebrated on March 11, 2026. A fun excuse to learn something new or gather your favorite people.
Photo: SGUL lymres via Wikimedia Commons.