Cinnamon and Oregano Oil Kill Gram-Negative and Resistant

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http://www.ncbi.nlm.nih.gov/pubmed/22827568

Evaluation of bacterial resistance to essential oils and antibiotics after exposure to oregano and cinnamon essential oils.

Bonus:
After the sequential exposure to both EOs, only Serratia marcescens, Morganella morganii, and Proteus mirabilis treated with oregano changed their antibiotic resistance profile and/or increased their resistance to this EO.