An explanation of the causes why vaccination has sometimes failed to prevent small pox : and also a description of a method, confirmed by experience, of obviating such causes / by Edward Leese.

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An explanation of the causes why vaccination has sometimes failed to prevent small pox : and also a description of a method, confirmed by experience, of obviating such causes / by Edward Leese. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.