REVACCINATION INTRODUCED.
When vaccination was seen to be no preventive of smallpox, it was conjectured that it might require renewal, a suggestion which distressed Jenner exceedingly. It was calculated, he said, “to do unspeakable mischief,” depriving his discovery “of more than half its virtues.” But as experience continued to belie the claim made for vaccination as a permanent defence, it was natural that those interested in its performance should endeavour to retrieve its waning credit. Thus revaccination began to be practised. Between 1830 and 1835 there were 13,861 revaccinations effected in the army of Wurtemburg. Dr. Holland (subsequently Sir Henry) after recording the accumulating proofs of the futility of vaccination in 1839, recommended revaccination as a probable resource, and the recommendation gradually acquired authority. The London Medical Gazette in 1844 boldly proclaimed, “Revaccinate, revaccinate!” But so late as 1851 the National Vaccine Establishment protested against the innovation, saying, “The restriction of the protective power of vaccination to any age, or to any term of years, is an hypothesis contradicted by experience and wholly unsupported by analogy.” Whatever the experience, however, and whatever the analogy, there was the indisputable fact, that vaccination in most unimpeachable form did not avert smallpox, and that if the public faith and the public money were to be retained, some fresh artifice was essential. It was hard to surrender the original claim of the equivalence of vaccination to smallpox; but it needs must when the devil drives; and so it has come to be admitted that Jenner was mistaken, and the vaccine rite to be effectual must be renewed.