Environmental control in asthmatic homes. The role of cheylatus mites. Preliminary report

Forty asthmatic patients with age ranges from 5 to 46 years were studied with three extracts in intradermal skin test: Dermatophagoides 1/10, Cheylatus 1/100 and house dust 1/500 w/v. Eighty five percent of patients were sensitive to house dust, 57.8% to Dermatophagoides and 55% to Cheylatus. Forty percent were positive to the three antigens and 12.5% were negative to these antigens. As the Cheylatus have been fed with Dermatophagoides, the positive reactions observed for the former could be influenced by this type of feeding. Therefore, Cheylatus must not be used in the patients' home for eradication of mites.