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Scanning electron micrograph of the nylon-flocked swab. (A) Swab head prior to sampling. Bar, 1 mm. (B) Enlarged view of panel A. Bar, 200 μm. (C) Fiber from the swab after sampling stainless steel coupons showing many B. atrophaeus spores. Bar, 5 μm. (D) Fibers of the swab after extraction. Only a few isolated spores appeared. Bar, 5 μm.
