title: Return to the days of von Magnus.
authors.affiliation: p.griffiths@ucl.ac.uk.
authors.forename: P D
authors.initials: PD
authors.lastname: Griffiths
mesh_terms: D000818:Animals; D001691:Biological Therapy / Q000379:methods*; D003673:Defective Viruses / Q000235:genetics / Q000254:growth & development*; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D009975:Orthomyxoviridae / Q000235:genetics / Q000254:growth & development*; D009976:Orthomyxoviridae Infections / Q000517:prevention & control* / Q000628:therapy*; D014773:Virology / Q000266:history* / Q000639:trends