Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

Koch's bacillus

play play
noun \ˈkōks-, ˈkäch-əz-\

Medical Definition of Koch's bacillus

  1. :  a bacillus of the genus Mycobacterium (M. tuberculosis) that causes human tuberculosis



Biographical Note for koch's bacillus

Koch \ˈkȯḵ\play (Heinrich Hermann) Robert (1843–1910), German bacteriologist. Koch is usually hailed as the founder of modern bacteriology. He is responsible for devising or adapting many of the basic principles and techniques (particularly staining methods) of bacteriology. He is most famous for isolating and obtaining in 1876 a pure culture of the bacterium (Bacillus anthracis) that causes anthrax, for discovering the cholera vibrio (Vibrio cholerae) in 1883, and for identifying and isolating the tubercle bacillus (Mycobacterium tuberculosis) in 1882. Koch published an epochal work on the etiology of traumatic infectious disease in 1878, and was the first (in 1887) to demonstrate that a specific microorganism is the cause of a specific disease. In 1890 he introduced tuberculin for the diagnosis of tuberculosis. Koch's postulates were first described in 1882 and then elaborated upon in 1884. The Koch-Weeks bacillus was discovered by Koch in 1883, and he described the Koch phenomenon in 1891. Koch was awarded the Nobel Prize for Physiology or Medicine in 1905.

Variants of koch's bacillus

or Koch bacillus \ˈkōk-, ˈkäch-\play play

Seen and Heard

What made you want to look up Koch's bacillus? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 7, 2016

a slight offense

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez kittly-benders duvet spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ