CAUTION: As a certified herbalist, let me alert you that while essential oils are very beneficial on the health level, they also are extremely potent. One or two drops in a cup of hot water are sufficient for drinking as a tea. Ingestion of half an ounce is so strong that, in some cases, it can kill . Keep out of reach of children.
An excellent book about which essential oil has which therapeutic values, including anti-microbial information:
Reference Guide for Essential Oils, by Connie and Alan Higley, published by Abundant Health, 11569 S. Burch Circle, ALoathe, KS 66061 AbundantHealth4U@juno.com (913) 438-2957/ fax (913) 438-2194