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1. A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.
2. The World Health Organization (WHO) is a specialized agency of the United Nations responsible for international public health. The WHO was established by constitution on 7 April 1948, which is commemorated as World Health Day.
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