The presence of viral particles in hybridoma clones secreting monoclonal antibodies.
D000818:Animals; D000911:Antibodies, Monoclonal; D006801:Humans; D006825:Hybridomas / Q000382:microbiology*; D051379:Mice; D014780:Viruses / Q000302:isolation & purification*
D000911:Antibodies, Monoclonal