nowadays, safer vaccine are produced.give reason
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yes!nowadays, safer vaccine are produced Infectious diseases before and after a vaccine was introduced. Vaccination has a direct effect on the diminishment of the number of cases and contributes indirectly to a diminishment of the number of deaths.
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yes nowadays safer vaccine are produced infectious disease before and after a vaccine was introduced.vaccine has a direct effect on the diminshment of the number of the cases and contributes indirectly to a diminshment of the number of deaths.
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