Waldemar Mordecai Haffkine(1860-1930), a Jewish bacteriologist , was born in Odessa, Ukraine. He got the doctor's degree of science of Odessa University in 1884 and entered the Pasteur Institute in 1889. Then he successively committed himself to developing cholera vaccine and plague vaccine. After testing them to himself, he set up extensive field trials in British India to prove the safety and efficacy. Further inoculation saved many lives. Later he was accused for the contamination of plague vaccine in Mulkowal Disaster in 1902, and finally exonerated in 1907. Haffkine was hailed as "Jewish Jenner"