Koch's Postulates 0 。Koch's Postulates The disease is reproduced in the second animal:microorganisms are used to prove are isolated from this animal. the cause of an infectious disease. Pathogenic microorganisms are grown in pure culture. Identical microorganisms are identified. Figure 14.3.2• Koch's Postulates are used to prove the cause of an infectious disease. Koch’s Postulates Figure 14.3.2