MUC5AC and Epstein-Barr virus infection: All cell types, including basal cells (p63-positive) (Figure 3a,b), goblet cells (MUC5AC-positive) (Figure 3c,d), and ciliated cells (βIV-tubulin-positive) (Figure 3e,f) were able to confirm EBV infection, by showing positive signals for EBER1 or BRLF1.