The protection was complete; and Jenner thenceforward
pursued his experiments with redoubled ardor. His first summary
of them, after having been examined and approved by several
friends, appeared under the title of 'An Inquiry into the Causes
and Effects of the Variolae Vaccinae,' in June, 1798. In this
important work he announced the security against the small-pox
afforded by the true cow-pox, and proceeded to trace the origin
of that disease in the cow to a similar affection of the horse's
heel."
This publication produced a great sensation in the medical world,
and vaccination spread so rapidly that in the following summer
Jenner had the indorsement of the majority of the leading
surgeons of London. Vaccination was soon introduced into France,
where Napoleon gave another proof of his far-reaching sagacity by
his immediate recognition of the importance of vaccination. It
was then spread all over the continent; and in 1800 Dr. Benjamin
Waterhouse of Boston introduced it into America; in 1801, with
his sons-in-law, President Jefferson vaccinated in their own
families and those of their friends nearly 200 persons. Quinan
has shown that vaccination was introduced into Maryland at least
simultaneously with its introduction into Massachusetts.
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