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Table 1 Summary of essential oil volatile constituent antimicrobial activity. The six divisions of antimicrobial activity are summarized with the following signs: - or +/− sign (none - negligible, 0 mm - 10 mm), + sign (low, 15 mm - 30 mm), ++ sign (moderate, 30 mm - 50 mm), +++ sign (high, 50 mm - 70 mm), and ++++ sign (highest, 70 mm - 80 mm). Each sign in the table represents the strength of the essential oil evaporative volatiles against the indicated microbe. The antimicrobial activity of the essential oil volatiles is graded from lowest on the left (clove), to highest on the right (rosemary)

From: Antimicrobial activity of the volatile substances from essential oils