Nasally infected and uninfected mice were euthanized, their tracheas were cannulated, and the lungs were perfused with 1 ml of cold sPBS three times, and a total of 3 ml BAL fluids were collected from each mouse. BAL fluid samples were centrifuged at 500 × g for 10 min at 4°C, and recovered fluids were filter-sterilized using 0.22 µ syringe filters. The sterile BAL fluid samples were stored at −70°C for cytokine analysis.
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