Dose-response differential gene expression. (A) Differential expression (DE) of transcripts for each dose is shown at each day postinfection. The number of DE transcripts was greatest for sublethal (104-PFU) and lethal (105-PFU) infections at day 2, with 2,091 and 2,251, respectively. In total across all 4 days, there were 3,138 unique DE transcripts for the 104-PFU infections and 3,683 for the 105-PFU infections. (B) The heat map shows the number of overlapping transcripts for each time point in both sublethal- and lethal-dose MA15 infections. Coloring represents the odds ratio or the effect size of each overlap, and gray numbers within the cells are the numbers of common differentially expressed (DE) transcripts. Analogous to differences in phenotype between infection doses, the overlap is strongest at day 2 and weakest at day 7 postinfection.