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We previously reported that Fel d 1 was measurable in 10 of 40 air samples and 38 of 40 dust samples obtained from homes without cats.1 We have reanalyzed the samples from 39 of these homes using a recently described amplified ELISA for Fel d 1.2 This modification uses a signal amplification by catalyzed reporter deposition originally described by Bobrow et al.3 Because assay sensitivity is greatly increased, we reexamined the relationship of settled dust and airborne levels in samples that we had collected previously.
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Bollinger et al. (1998) studied this question.
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