Some allergists may test for cotton linters, kapok, and pyrethrum. These items may be found in some homes and cause allergic symptoms in susceptible individuals.
For information on cotton linters, go down to chapter 6 Uses, 4th paragraph. My conception of this is the "lint" from cotton fabrics. This is not found near as often as more than 30 years ago.
Kapok trees produces a fiber which may be used as stuffing in household items in place of down stuffing.
Sometimes these fibers can cause allergic reactions.
Pyrethrum is the name for a group of flowers, that may have been used for decoration in homes.
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