Much attention has been given on the internet to the “anti-vaccination” movement—using vaccination in its wider sense of “any immunisation”—and its possible harmful effects on uptake rates of immunisations. Many observers believe that the movement is something new and a consequence of concerns arising from the large number of immunisations now given, but concern over vaccination began shortly after the introduction of smallpox vaccination and has continued unabated ever since. Methods of disseminating information have changed since the 19th century, but the concerns and activities of anti-vaccination movements in the United Kingdom and their counterparts in the United States have changed little since then. The historian Martin Kaufman, writing about anti-vaccination movements in 19th and early 20th century America, concluded his paper with this comment, “With the improvements in medical practice and the popular acceptance of the state and federal governments' role in public health, the anti-vaccinationists slowly faded from view, and the movement collapsed.”1 We hope that a brief historical examination of anti-vaccination sentiments will give medical professionals a better sense of perspective about the groups opposing immunisations and their arguments.