Fracastorius (1478-1553):
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Fracastorius

• Studied epidemics
Ferdinand Cohn (1872):
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Ferdinand Cohn

• Coined term bacteria
Sedillot (1878):
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Sedillot

• Coined term microbes
Robert Koch (1843-1910):
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Robert Koch

• Gave four Koch’s postulates to prove pathogenicity of pathogen

Beijerinck (1898):
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Beijerinck

• Introduced enrichment technique

Thomas Burrill (1878):
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Thomas Burrill

• He introduced Erwinia amylovora (called by him Micrococcus amylovorus) as the causal agent of pear fire blight.