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World Health Day
7 April is World Health Day World Health Day 2026, observed on 7 April, calls on people everywhere to stand with science. Under the theme “Together for science”, this year’s observance launches a year‑long campaign celebrating the power of scientific collaboration to protect the health of people, animals, plants, and the plane. Learn more.
World Immunization Week
World Immunization Week is celebrated annually during the last week of April (April 24–30) to promote vaccine use, protecting people of all ages against diseases. Led by the WHO, the 2025 theme is "Immunization for All is Humanly Possible," highlighting vaccines' role in saving over 154 million lives in 50 years.