Translocation of Indigenous Bacteria

I found an interesting article about the bacteria in the GI. According to the article, an experiment done on mice was to inject indigenous bacteria E. coli and L. acidophilus. After a couple of days the bacteria was translocated to different parts of the subjects body, perhaps where it was of a low concentration. This was shown by the translocation of the E. coli to the lymph nodes, spleen, and liver. Therefore this article introduced a ways to improve the protection of the body against bad bacteria by placing the extra indigenous bacteria where it was low in amounts.

http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=414179&blobtype=pdf