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Large-airway lymphocytic bronchitis was graded according to the following criteria: E0, no chronic inflammation; E1, minimal to mild chronic inflammation with a band of subepithelial lymphocytes and up to occasional intraepithelial lymphocytes; and E2, moderate to severe chronic inflammation with a prominent subepithelial band of lymphocytes, scattered intraepithelial lymphocytes, and at least rare epithelial cell necrosis.
