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Scanning electron microscope images of several swab materials. (A) Foam swab (Sterile Foam Tipped applicator, Puritan); (B) rayon swab (155C Rayon, Copan); (C) polyester swab (159C Polyester, Copan); and (D) flocked swab (3503C 4 ng Floqswab, Copan).
