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. 2019 Aug 14;10:1923. doi: 10.3389/fimmu.2019.01923

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Copyright © 2019 Song, Zhao, Li, Lu, Zhou, Zhang, Chen, Tang, Zhou, Yin, Weng and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Representative images of hematoxylin and eosin staining of mouse lung tissue specimens. Lung tissue specimens were collected on the 15th, 17th, 19th, 21st, 28th, 42nd, 56th day (n = 6 each group). H and E staining was performed. The WT-PA and WT-PA + IFA groups show lymphocyte accumulation in the bronchial areas and chronic inflammation, small amount of macrophages (arrows) accumulated in the bronchial areas and immature granuloma on the 42nd day, and loose granuloma (arrows) on the 56th day. The images are 200×.