part of viral life cycle symbiont entry into host symbiont entry into host cell https://github.com/geneontology/go-ontology/issues/26670 The process by which a symbiont breaches the plasma membrane or cell envelope and enters the host cell. The process ends when the symbiont or its genome is released into the host cell. Reactome:R-HSA-168270 entry of virus into host cell GO:0046718 virion penetration into host cell GO:0019063 viral penetration virus entry into host cell viral entry into host cell Viral attachment to the host cell is not part of viral entry in GO because virus attachment does not always lead to viral entry: attachment can also result in the virion being carried by the host cell to another location. Reactome:R-HSA-8876384 VZ:936 biological_process virion penetration phage translocation