Koch's postulates (or Henle-Koch postulates) are four criteria that were formulated by Robert Koch and Friedrich Loeffler in 1884 and refined and published by Koch in 1890.
Koch's postulates (or Henle-Koch postulates) are four criteria designed to establish a causal relationship between a causative microbe and a disease. The postulates were formulated by Robert Koch and Friedrich Loeffler in 1884 and refined and published by Koch in 1890.