Fig. 1

Syncytium induced by virus infection in Vero E6 cell line. Uninfected cells (A and C) were compared with cells infected by hMPV-A1 (B) and hMPV-B1 (D), respectively. Cells were stained by means of the Fast staining in haematology (fast panoptic) kit (PanReac AppliChem). Images were acquired with a Leica Mateo TL microscope.