title: Infectious agents in Crohn's disease-fact or artefact?
mesh_terms: D001419:Bacteria / Q000302:isolation & purification; D003106:Colon / Q000648:ultrastructure; D003424:Crohn Disease / Q000382:microbiology*; D006801:Humans; D007739:L Cells; D014780:Viruses / Q000302:isolation & purification