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SIM test is a test performed to test for sulfur reduction, Indole production and motility. Black color formed= positive for sulfur reduction Red color after adding Kovacs reag â¦ ent= positive for Indole production Microorgaism growth all over the tube= motile.
A positive result does not mean that you have active TB disease right now -- the TB in your body could be either active or inactive. Active TB is bad for your health and contagious to other people, while inactive TB is not. And so, after a positive TB test, you will need further testing to determine whether you have active or inactive TB infection. A negative test result means that your system does not recognize TB, most likely because you have never been exposed to TB. After a negative result, further testing is usually not needed. AITC offers 2 types of tests for TB.