Cf. Carson et Tv. Riley, SUSCEPTIBILITY OF PROPIONIBACTERIUM-ACNES TO THE ESSENTIAL OIL OF MELALEUCA-ALTERNIFOLIA, Letters in applied microbiology, 19(1), 1994, pp. 24-25
The susceptibility of 32 strains of Propionibacterium acnes to the ess
ential oil of Melaleuca alternifolia, tea tree oil, was examined using
a broth dilution method. The minimum bactericidal concentration of te
a tree oil for five strains was 0.25% or less while, for the remainder
, it was 0.50%.