Beneficial bacteria

Describe a beneficial use for bacteria of the microbiome in treating disease. These answers can vary and may be experimental. Use some outside library resources like CINAHL Plus with Full Text or NCBI.gov to find these unique bacterial applications. Entries should include an overview of the viral application and the benefit to patient health or society. Also include any complications with this strategy preventing its immediate application.
As a public health professional, what advice would you give the patient to educate them: signs and symptoms, and risks and adverse effects of the probiotic treatments.