Does it work? - The Irish Times - Tue, Feb 01, 2011.
A small but growing number of studies are producing interesting results. For example, an Australian study found that several essential oils were antibacterial, including against MRSA. They showed that this was not due to the oily liquid, because other oils were not active. Some essential oils were as effective as ethanol, peroxide and other disinfectants. However, the oils of thyme white, lemon, lemongrass and cinnamon were much more active against a wide range of microbes. Few studies have involved humans, but such research is being conducted. For example, scientists at Manchester Metropolitan University showed that a blend of lemongrass and geranium essential oils was antibacterial against MRSA. When the oil was placed in a sealed box containing MRSA, bacterial growth was reduced by about one-third. They developed a vaporiser to deliver the oil vapours into an office overnight while unoccupied. The number of airborne bacteria in the office was reduced by 89 per cent. Then they used the vaporiser in the burns unit of a Manchester hospital for nine months. They found similar reductions in airborne bacteria and had no MRSA outbreaks while using the vaporiser.