Robert Koch

Robert Koch (11 December 1843 - 27 May 1910) was a German doctor. He won the 1905 Nobel Prize in Physiology or Medicine, for studying tuberculosis.
The Royal Prussian Institute for Infectious Disease started in 1891, is now called the Robert Koch Institute.
Koch's postulates.
Koch developed a system to check whether a microorganism caused a disease. The system was four questions, known as Koch's postulate.
Koch's postulates are the following:
The postulates are still useful. Many variations have been developed.