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Pulmonary neutrophil density in the treatment groups. All PIV3-infected groups had higher neutrophil densities than the control group. The PIV3/Ad/HBD6 group had increased neutrophil density compared with those of the PIV3 and PIV3/Ad groups. *, P < 0.05 compared with the results for the controls; **, P < 0.05 compared with the results for the PIV3 or PIV3/Ad group.
