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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Clin+Pathol 2015 ; 68 (1): 57-63 Nephropedia Template TP
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Molecular pathology analyses of two fatal human infections of avian influenza A(H7N9) virus #MMPMID25378539
Feng Y; Hu L; Lu S; Chen Q; Zheng Y; Zeng D; Zhang J; Zhang A; Chen L; Hu Y; Zhang Z
J Clin Pathol 2015[Jan]; 68 (1): 57-63 PMID25378539show ga
AIMS: To investigate the histopathological manifestations of two fatal cases of H7N9 influenza A virus infection. METHODS: Pulmonary and hepatic specimens from two fatal cases of H7N9 influenza virus infection were examined using H&E staining. Additionally, in situ hybridisation was performed with probes (ViewRNA) targeting H7N9 RNA and IP-10, interleukin (IL)-6 mRNA. The distribution of surfactant protein A (SP-A), surfactant protein B (SP-B), CD3, CD4, CD8, CD68 and C4d were determined with immunohistochemistry. RESULTS: Apart from the typical diffuse alveolar damage and hyaline membrane observed in severe influenza infection, we detected H7N9 RNA and massive intrapulmonary production of IP-10 and IL-6 mRNA using in situ hybridisation. Hyperplasia of type II pneumocytes was observed by H&E staining and immunohistochemistry. Proliferating macrophages and clustered neutrophils in the infected lungs were observed, whereas T lymphocytes, especially CD4T helper cells, were markedly depleted. No obvious complement deposition was found in lung tissues. CONCLUSIONS: Our findings suggest that H7N9 influenza virus induced an immunological response towards overt pulmonary inflammation and systemic lymphopenia which led to intense alveolar damage and respiratory failure.