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  • Title: Usefulness of skin test in Farmer's lung.
    Author: Morell F, Orriols R, Molina C.
    Journal: Chest; 1985 Feb; 87(2):202-5. PubMed ID: 3967527.
    Abstract:
    The skin test with hay extract or with Micropolyspora faeni (MF), is not commonly used in the diagnosis of Farmer's lung (FL), as it is not considered specific. In our study, we have applied the intracutaneous test with these antigens in 26 patients affected with FL; 18 of them were still in contact with the antigen and the remaining eight had not been in contact with the hay during the previous year. Twenty-five asymptomatic farmers (AF) served as a control group. In the first group and with hay extract, the immediate reading (I) was positive in 15 of 18 (83.3 percent), the late reaction (L) in 18 of 18 (100 percent), and the delayed one (D) in eight of 18 (44.4 percent). In the 25 AF, the results were as follows: I, seven of 85 (28 percent); L, 17 of 25 (68 percent); and D, one of 25 (4 percent). Consequently, the differences between both groups were significant: I, p less than 0.01; L, p less than 0.05; and D, p less than 0.01. Using MF as an antigen, the test is somewhat less effective: p less than 0.02, p less than 0.02, and p less than 0.2, respectively. These results suggest that the intradermal injection with hay extract is an easy, effective test in the diagnosis of FL, and at the same time, a better means of distinguishing FL patients from AF than the precipitation test.
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