The tropical rat mite, Ornithonyssus bacoti, has been detected in Switzerland for the first time in 3 patients suffering from a small papulous dermatitis. The lesions, distributed over the whole body, were especially intense on the arms and legs. The sting of O. bacoti was always very painful and the itching lasted for several weeks. The parasites were found on the skin of the patients, on one rat caught near the workroom, and in dust samples collected from the infested site.
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