a preparation made from an attenuated live mycobacterium and nonviable fractions such as a methanol extract residue that is used in immunotherapy to enhance the immune system of cancer patients. BCG is also used to treat bladder cancer and other tumors when given by instillation or intratumor injection.

A live, avirulent bacterial cell preparation of the bovine tuberculosis organism, Mycobacterium bovis; useful for immunizing people against tuberculosis and for nonspecifically stimulating the immune system.

Used as an instillation into the bladder to help reduce symptoms of IC.