a Type 2 cytokine gene expression (Ccl11 C-C motif chemokine 11, Ccl24 C-C motif chemokine 24, Il4 interleukin 4, Il5 interleukin 5, Il13 interleukin 13) normalized to Gapdh expression at 2- and 5 days post-infection (DPI) with Rs-SHC014-CoV in mice vaccinated with inactivated influenza virus adjuvanted with aluminum hydroxide (iFLU + Alum), inactivated SARS-CoV-2 adjuvanted with aluminum hydroxide (iCoV2 + Alum), or inactivated SARS-CoV-2 adjuvanted with Sigma Adjuvant System adjuvant (iCoV2 + RIBI); Ccl11, Ccl24 2 DPI – iFLU + Alum (n = 12), iCoV2 + Alum (n = 12), iCoV2 + RIBI (n = 6); Ccl11, Ccl24 5 DPI – iFLU + Alum (n = 14), iCoV2 + Alum (n = 13), iCoV2 + RIBI (n = 9). Il4, Il5, Il13 2 DPI – iFLU + Alum (n = 12), iCoV2 + Alum (n = 12), iCoV2 + RIBI (n = 6); Il4, Il5, Il13 5 DPI – iFLU + Alum (n = 13), iCoV2 + Alum (n = 13), iCoV2 + RIBI (n = 9); individual data points represent independent biological replicates; results presented from one animal experiment and analyzed by Kruskal–Wallis test with Dunn’s multiple comparisons correction; solid horizontal lines and error bars overlaying data represent group means ± standard deviation; solid horizontal lines above data represent pairwise comparisons with p values. b, c Volcano plots showing differential expression by RNA-Seq between iCoV2 + Alum relative to iCoV2 + RIBI at 2 DPI (b) and 5 DPI (c) following infection with Rs-SHC014-CoV. Fold change (FC) is shown along the X-axis (with 1.5 log2 FC thresholds represented by vertical dashed lines) and significance along the Y-axis (with false discovery rate-adjusted q < 0.05 thresholds represented by horizontal dashed lines). Key genes are highlighted in the upper right (iCoV2 + Alum expression > iCoV2 + RIBI) and upper left (iCoV2 + Alum expression < iCoV2 + RIBI) quadrants. 2 DPI (n = 12) and 5 DPI (n = 9) for iCoV2 + Alum, and 2 DPI (n = 6) and 5 DPI (n = 5) for iCoV2 + RIBI; results presented from one animal experiment and analysis described in detail in RNA Sequencing (RNA-Seq) in Methods. Source data are provided as a Source Data file. RNA Sequencing raw .fastq data files are submitted to the Sequence Read Archive (SRA) database under BioProject ID PRJNA1022427.