CHGA and infection: Moreover, the abundance of the panendocrine cell markers chromogranin A (CHGA) and CHGB, which are weakly upregulated during the early stages of infection (Fig. 2F) (20), was decreased from 17 to 48 DPI (Fig. 2F), and ChgB was significantly transcriptionally downregulated from 13 to 48 DPI compared to UI mice (Fig. 2J).