Abstract
Examination by scanning electron microscopy (SEM) of PK-15 cells infected with each of the two cytopathogenic types of porcine enterovirus revealed changes similar to those observed by light microscopy. However, differences between the two types could be detected at an earlier stage of the infection. Cells infected with T80 virus (type 1) were rounded, with surface microridges, while V13 (type II) infected cells were characterized by cytoplasmic protrusions.