The origin of the vaccine inoculation / [Edward Jenner].

  • Edward Jenner
Date:
1801
Catalogue details

Licence: Public Domain Mark

Credit: The origin of the vaccine inoculation / [Edward Jenner]. Source: Wellcome Collection.

    11/16 page 9
    [ro] Here the clofe analogy between the Virus of Small Pox and of Cow Pox becomes remarkably confpicuous; fince the former, when taken from a recent puftule, and immediately ufed, gives the perfect Small Pox to the perfon on whom it is inoculated: but when sheet ic a far advanced ftage of the difeafe, or when (although taken early) previouily to its infertion, it be expofed to fuch agents as, according to the eftablifhed laws of Nature, eaufe its decompofition, it can no longer be relied on as effectual. This obfervation will fully explain the fource of thofe errors which have been committed by many inoculators of the Cow Pox. Conceiving the whole procefs. to be fo extremely fimple, as not to admit of a miftake, they have been heedlefs about the ftate of the Vaccine Virus; and finding it limpid, as part of it will be, even in an advanced ftage of the puftule, when the greater portion has been converted into a fcab, they have felt an improper confidence, and fometimes miftaken a fpurious puftule, which the Vaccine fluid in this ftate is capable of exciting, for that which pofleffes the perfect character. During the inveftigation of the cafual Cow Pox, I was | ftruck.
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