The bacterium known as Bacillus oleronius has also been found in the digestive tract of a Demodex mite taken from a person with rosacea. This bacterium is susceptible to some of the antibiotics used to treat rosacea, and it also produces molecules that trigger an immune reaction in people with rosacea.
Another type of bacteria, Staphylococcus epidermidis, has been found in pustules of rosacea patients but not in areas of the skin that are rosacea-free. This bacterium, as well, is sensitive to many of the antibiotics used to treat rosacea.
"This research is provocative in that it is proposing a cause for rosacea which up to this point has been unknown," said Dr. Chris Adigun, an instructor in the department of dermatology at NYU Langone Medical Center, in New York City.
But Adigun adds, it will be difficult to prove that bacteria within Demodex mites are responsible for rosacea.
"We find it on healthy people as well as on people with rosacea," she pointed out. "Furthermore, treatment options that improve rosacea symptoms do not alter the concentration or life cycle of mites," she added.
More information
The American Academy of Dermatology has more on rosacea.
SOURCES: Michele Green, M.D., dermatologist, Lenox Hill Hospital, New York City; Chris G. Adigun, M.D., instructor, department of dermatology, NYU Langone Medical Center, New York City; Aug. 30, 2012, Journal of Medical Microbiology online
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