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SEM images of rat middle ear colonized with S. pneumoniae D39 in the presence or absence of ASD. (A–C) Are SEM images of rat middle ear of vehicle control. (D–F) Are SEM images of rat middle ear injected with ASD (300 μg/ml). (G–I) Are SEM images of rat middle ear infected with S. pneumoniae only. (J–L) Are SEM images of rat middle ear injected with ASD + S. pneumoniae.
