Lethal effects of two types of oxygen absorbers on three house dust mites, Dermatophagoides farinae, D. The lethal effects of two types of oxygen absorbers on the house dust mites, Dermatophagoides farinae, D.pteronyssinus and Tyrophagus putrescentiae were studied. The mortality obtained after 48 hours in an air-tight container with iron (Fe)-type oxygen absorbers was 100% for D. farinae, and D. pteronyssinus, but was not 100% for T. putrescentiae. On the other hand, the mortality obtained after 72 hours in an air-tight container with ascorbicacid-type oxygen absorbers was not 100% for either Dermatophagoides species, suggesting that their tolerance to oxygen deprivation increased in the presence of carbon dioxide derived from the ascorbic-acid-type of oxygen absorber.