A study by Sengul et al. (2009) described the zonal inhibition of
methanol and water extracts (300 lg/ml) from the aerial parts of T.
officinale against 32 selected food-borne microorganisms. Antimicrobial
activity for the methanol extract of T. officinale was
observed against 11 of the 32 microorganisms investigated, including
strains of B. cereus, E. coli and S. aureus. This activity was subsequently
linked to the phenolic content of the extract. In the
current study, the ethanol extract of T. officinale demonstrated
antimicrobial activity against S. aureus (MIC = 375 lg/ml), MRSA
(MIC = 375 lg/ml) and B. cereus (MIC = 375 lg/ml). However, no
antimicrobial activity was observed against E. coli.