Eating or drinking products rich in probiotics is thought to be helpful for many infections because growth of these bacteria is promoted, over other possibly harmful bacteria that may be present. They are partners in aiding good digestion whilst boosting the immune system. One member, Bifidobacteria infantis has been proven to dramatically reduce irritable bowel syndrome (IBS).

As only live organisms can provide any health benefits it is essential for manufacturers to be able to count the number of Bifidobacteria present in their products. Producers of products such as probiotics yoghurts, yoghurt like products or dried milk products, e.g. Bifidobacteria - containing infant milk formula, need to be able to specify the number of presumptive Bifidobacteria in their products.

The new Merck TOS MUP medium allows manufacturers to reliably count these organisms.