Red and yellow circles (smallpox pustules) in the form of an open-mouthed face, with text offering a reward for notification of the disease. Colour lithograph after René Gauch.

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Credit

Red and yellow circles (smallpox pustules) in the form of an open-mouthed face, with text offering a reward for notification of the disease. Colour lithograph after René Gauch. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.