A recent study suggests that exposure to house dust mites leads to the development of asthma in children who are predisposed to the disease.

House dust mites are members of the spider family that are too tiny to be seen with the naked eye. They produce substances which have provoked asthma episodes in large numbers of patients.

Researchers studied 67 children born in 1977 and 1978 who had at least one parent with asthma or hay fever. Of the 17 children with active asthma, 16 had inherited allergic tendencies and all 17 had evidence they were allergic to house dust mites.

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