No, they are not. House-dust-mites are natural, harmless cohabitants, which reside in all parts of human dwellings. Only areas located at altitudes of more than 5,000 ft. above sea level, deserts or arctic regions are almost free of house-dust-mites, as the living conditions in these zones are unfit for the mites.
Yet, it is necessary to keep the number of mites as small as possible and to avoid contact with the mite faeces for the most part, if possible.
Further information at :
Quelle
Verband der Deutschen Daunen- und Federnindustrie e.V.
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