2 Robert Koch
Robert Koch was a German microbiologist and physician. One of the prominent co-founders of modern bacteriology, Koch is credited with creating and improving laboratory techniques and technologies in the field of microbiology. He is also credited with making important discoveries in public health. In 1905, Robert Koch won the Nobel Prize in Physiology or Medicine for his research on tuberculosis.
3 Martinus Beijerinck

4 Waldemar Haffkine

5 Sergei Winogradsky

6 John Franklin Enders
7 Ferdinand Cohn
Ferdinand Cohn was a German biologist who is credited with co-founding microbiology and modern bacteriology. Apart from publishing more than 150 research reports, Cohn also made significant contributions to the field of botany. He was also the first person to classify algae as plants. Ferdinand Cohn received the prestigious Leeuwenhoek Medal in 1885.
8 Heinrich Anton de Bary

German surgeon and botanist Heinrich Anton de Bary is regarded as the pioneer of plant pathology and mycology. Apart from teaching botany, he chalked the life cycles of many fungi and also coined the term symbiosis to explain the mutually beneficial co-existence of many orgnanisms, such as fungi and algae.
9 Jules Bordet
10 Rebecca Lancefield

11 Jacob Dolson Cox

Apart from being a lawyer and a war historian, Jacob Dolson Cox had served as the governor of Ohio and as a US representative from Ohio's 6th district. During the American Civil War, he was a Union general. As the Secretary of the Interior, he introduced a civil service merit system.
12 Friedrich Loeffler

13 Johannes Eugenius Bülow Warming

14 Shiga Kiyoshi

15 Max Schultze

16 Félix d'Hérelle

17 Fritz Schaudinn

18 August von Wassermann

19 Friedrich Karl Kleine
