IL17A and viral infectious disease: As shown by the microarray results, the expression of the IL-17A gene tended to gradually increase during the progression of viral infection (Fig. 5a), which was consistent with both of the results from the qRT-PCR amplification on lung tissues (Fig. 5b) and the immunohistochemical staining of the pulmonary alveolar walls of the lung tissues (Fig. 5c).