In this plague, from 1898 to 1908, about six million people died in India. Other major epidemics include the Hong Kong plague and the Northeast plague. In 1894, Swiss-born French bacteriologist Alexandre Yersin successfully isolated "Yersinia pestis" in Hong Kong for the first time. In 1897, Russian borne French microbiologist Waldemar Haffkine invented the first human plague vaccine.