3] Why vacciences are gives to in facts?
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the process in which fertile land become desert is called desertification
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So, more than one dose is needed to build more complete immunity. The vaccine that protects against the bacteria Hib, which causes meningitis, is a good example. For some vaccines, after a while, immunity begins to wear off. At that point, a “booster” dose is needed to bring immunity levels back up.
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