bacteriotherapy

noun
bac·​te·​ri·​o·​ther·​a·​py | \bak-ˌtir-ē-ō-ˈther-ə-pē \
plural bacteriotherapies

Medical Definition of bacteriotherapy 

: the treatment of disease by the use of bacteria or their products After many months of return infections and thousands of dollars spent on antibiotics, some doctors are suggesting a bizarre-sounding treatment—replacing the missing good bacteria by transplanting the stool of a healthy spouse or relative, sometimes known as bacteriotherapy.— Don Finley, The San Antonio Express-News, 20 Oct. 2010

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