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Histopathological examination of lung tissue. Lung tissues were fixed and stained with hematoxylin and eosin at 14 days after the last intranasal inoculation with M. pneumoniae No. 4 or FH strain (magnification, ×75). (A) Repeated infection with No. 4 strain. (B) Repeated infection with FH strain. (C) Single infection with No. 4 strain. (D) Single infection with FH strain. (E) Mock infection with PPLO broth. (F) Untreated control.
