|Contribution||May have swallowed cholera bacteria to test causation of disease.|
|Notes||Edward Klein. While not giving detaills, Waller indicates that Klein was the first to perform the sef-inoculation experiment made famous by Pettenkofer. The date of Klien's experiment is implied not stated, and Klein's precise purpose is not given. If 1884 is correct for Klein, then (according to Waller) his experiment and Pettenkofer's experiment would have been done in the same year. Magner, however, gives 1892 as the year of Pettenkofer's self-inoculation.|
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