The experimental production of combination forms of virus.  V.  Alterations in the virulence of neurotropic influenza virus as a result of mixed infection.
D060085:Coinfection; D006801:Humans; D007251:Influenza, Human; D009975:Orthomyxoviridae; D012328:RNA Viruses; D014774:Virulence
INFLUENZA VIRUSES