The word "cytopathic" refers to something that can harm or damage cells in the body. It describes a substance or organism that has the ability to cause diseases or abnormalities in cells. Full definition
After 72 hours of incubation, when the virus control wells exhibited advanced virus - induced CPE, the neutralizing capacity of individual serum samples were assessed by determining the presence or absence of cytopathic effect (CPE). (journals.plos.org)
Viral replication was monitored over 14 days by visual inspection under light microscopy for cytopathic effect (CPE). (journals.plos.org)