Haffkine focused his research on developing a cholera vaccine, and produced an attenuated form of the bacterium. Risking his own life, on 18 July 1892, Haffkine performed the first human test on himself and reported his findings on 30 July to the Biological Society. Even though his discovery caused an enthusiastic stir in the press, it was not widely accepted by his senior colleagues, including both Mechnikov and Pasteur, nor by European official medical establishment in France, Germany and Russia.[citation needed]