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. 2021 Sep 20;11:18641. doi: 10.1038/s41598-021-97535-6

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Histopathological analysis of hematoxylin and eosin (H&E)-stained lungs. The left lungs were dyed with H&E for histological assessment. All images were obtained at 200 × magnification. (A) The left lungs were dyed with H&E for histological assessment. (B) Scoring of alveolitis in immunized mice after hRSV challenge. (C) Scoring of interstitial pneumonitis in immunized mice after hRSV challenge. (D) Scoring of bronchiolitis in immunized mice after hRSV challenge. The degree of inflammation in the alveolar tissue was graded as follows: 0, normal; 1, mild inflammation; 2, moderate inflammation; 3, marked inflammation; and 4, severe inflammation. Statistically significant differences were determined by one-way ANOVA with the Newman-Keuls posttest. *p < 0.05, **p < 0.01, ***p < 0.001. The bars represent the mean values with standard deviations.