Some observations on accidental vaccinations on the hands of workers in a vaccine lymph institute

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Abstract
1. A series of cases of repeated accidental vaccinal infections of vaccinia and vaccinoid types in subjects possessing strong or complete vaccinal immunity, is presented.2. It is suggested that there is a similarity between such cases and the repeated infections on the hands of farm workers and milkers handling cows naturally infected with cowpox.3. It is difficult to fit satisfactorily such facts into the framework of the modern theory of vaccinal immunity, but no explanation of the apparent discrepancy can be suggested.