TREM1 and viral infectious disease: During the first4 h of infection, no differences were observed in the expression ofTREM-1 related genes compared to the mock group (simulated viral infection).However, at 8 and 12 h postinfection, the set of genes coding forthe TREM-1 pathway showed increased expression compared to the othergroups and time points (16 and 20 h) (Figure 1C).