Mice were sacrificed at 2 and 4 days p.i., lungs were collected and snap frozen for preparing the lung homogenates for viral titer measurement according to our previous publication60 . Mice were sacrificed at 15 days p.i., and whole blood was collected through the posterior vena cava vein. Serum was separated from whole blood by centrifugation (12,000 × g, 10 min at room temperature). The IAV-specific IgG2a and IgA antibodies in serum were determined using ELISA via serial dilution as described in our previous publication60 .
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