| http://www.w3.org/ns/prov#value | - I???m not sure that there is any natural lifetime immunity to things such as tetanus which do require boosters ??? I have not seen any studies that really make the case that vaccine immunity is inferior to ???natural??? immunity (vaccines don???t always grant immunity, they do have a failure rate, but that???s a different question ??? and the failure rates are also well-studied).
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