Waste products excreted by these mites, which are mainly proteins, are the main substances to which allergic people react. Each mite excretes about 20 of these pellets every day.
These pellets, minute in size, continue to cause allergic symptoms even after the mite is dead. A female mite lays 25 to 50 eggs and a new generation is produced every three weeks.
There is a direct relationship between the number of mites in the house dust, the degree of allergy and the symptoms of asthma. Tests done with extracts made from the laboratory cultivated mite (D. pteronyssimus), showed that all individuals who had positive reactions to the mites also reacted to house dust extract. “We have not yet seen a case in which a patient reacted to house dust and not to this particular species of mite or vice-versa,” says Dr Voorhorst, the researcher who discovered mite as the cause of house dust allergy.
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