| http://www.w3.org/ns/prov#value | - Jenner's cowpox vaccination was made with attenuated virus.The vaccine should be life-long, but the virus can revert to virulence, is unstable biochemically (the process used to attenuate the virus may fail), contamination is a problem (witness the smallpox lab that has yet to produce a batch FDA will approve), and if you vaccinate the wrong people, they can get very sick.Guess I should get that p
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