All of the following statements reflect the qualities of a safe and effective vaccine, except

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A safe and effective vaccine should not require booster shots every 5 years to maintain efficacy. The other statements are true for a safe and effective vaccine. The injected material should be antigenic to stimulate an immune response, but not pathogenic to cause disease. It should ideally have a long shelf-life, be affordable to produce, and easy to administer. A safe and effective vaccine should also confer both humoral and cell-mediated immunity.

All of the Following Statements Reflect the Qualities of a Safe