These 4 IMViC tests - Indole, Methyl red, Voges-Proskauer, Citrate + and H2S (actually 6 tests if you include motility and H2S) - constitute, perhaps, the most critical tests used for identification o...These 4 IMViC tests - Indole, Methyl red, Voges-Proskauer, Citrate + and H2S (actually 6 tests if you include motility and H2S) - constitute, perhaps, the most critical tests used for identification of bacteria after the gram stain. The test results from these 6 tests should carry more weight than almost any other tests, certainly higher priority than sugar results since they are more stable reactions.
