Which bacteria did oregano essential oil prove effective at blocking growth against in laboratory tests?
Answer
*Escherichia coli* and *Pseudomonas aeruginosa*
A significant benefit attributed to oregano essential oil is its potent antimicrobial activity, which includes antibacterial properties relevant in the context of increasing antibiotic resistance. Laboratory assessments have specifically shown that the essential oil can effectively inhibit the proliferation of problematic pathogenic bacteria such as *Escherichia coli* and *Pseudomonas aeruginosa*. While the text also notes that carvacrol and thymol exhibit direct antiviral action against pathogens like norovirus and herpes simplex virus, the specific mention regarding blocking bacterial growth centers on *E. coli* and *P. aeruginosa*.

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