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प्रश्न
What is vaccine? What are its types?
टिप्पणी लिखिए
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उत्तर
A vaccine is a biological preparation that provides active acquired immunity to a particular disease and resembles a disease causing microorganism and is often made from weakened or attenuated or killed forms of the microbes, their toxins, or one of its surface proteins.
The vaccines are classified as first, second and third generation vaccines.
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