Ot- Gone for a bit..

This will help you justify the results of the abx: From a single bacteria to Sepsis - selective pressure. Hopefully the link works.

www.plospathogens.org/article/info%3Adoi%2F10.1371%2Fjournal.ppat.1004026


EDIT: Here workable link :www.ncbi.nlm.nih.gov/pmc/articles/PMC3961388/