visit a nearby vaccination centre and collect information about the kinds of vaccination their appropriate time period and fruitful results and the modern time
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Four types of vaccines are currently available: Live virus vaccines use the weakened (attenuated) form of the virus. The measles, mumps, and rubella (MMR) vaccine and the varicella (chickenpox) vaccine are examples
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about the kinds of vaccination their appropriate time period and fruitful results and the modern tim
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