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Vaccines were developed to provide immunity to a viral infection. Which of the following is a likely hypothesis of why the smallpox vaccine is no longer given?
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Vaccines were developed to provide immunity to a viral infection. Which of the following is a likely hypothesis of why the smallpox vaccine is no longer given?

User Ashkru
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People have grown completely immune to smallpox, meaning that the vaccine has done it's job and is no longer needed.
User Adi Tiwari
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