PDCD1 and infection: In this study, by applying whole-transcriptome sequencing, we identified 84 dif-mRNAs, 36 dif-miRNAs, 90 dif-lncRNAs, and 22 dif-circRNAs in PD-1 antagonist treated A/PR8(H1N1) influenza infected lungs compared with those in the controls (IgG2a isotype control treated before infection).