Results from pre-clinical research conducted at the University of Colorado Boulder in the USA led by Dr Chris Lowry, as part of an agreement with Immodulon to test Mycobacterium vaccae NCTC11659 in a variety of laboratory models of mental health disorders.

Full title: Mycobacterium vaccae NCTC11659 in a variety of laboratory models of mental health disorders.
Journal: Proceedings of the National Academy of Sciences (PNAS)
Author[s]: Stefan O. Rebera, Philip H. Siebler, Nina C. Donnerc, James T. Mortonc, David G. Smith, Jared M. Kopelmanc, Kenneth R. Lowe, Kristen J. Wheeler, James H. Fox, James E. Hassell Jr., Benjamin N. Greenwoodc, Charline Jansch, Anja Lechnere, Dominic Schmidte, Nicole Uschold-Schmidt, Andrea M. Füchslb, Dominik Langgartnerb, Frederick R. Walkerf, Matthew W. Haleg, Gerardo Lopez Perezc, Will Van Treurenh, Antonio Gonzálezi, Andrea L. Halweg-Edwardsk, Monika Fleshnerc, Charles L. Raisoni, Graham A. Rookn, Shyamal D. Peddadao, Rob Knighti, and Christopher A. Lowry
Date : May 2016
DOI: 10.1073/pnas.1600324113

The study was discussed on the BacterioFiles podcast in January 2017.