title: Weakened immunity in aged hosts with comorbidities as a risk factor for the emergence of influenza A H7N9 mutants.
authors.forename: Jesus F
authors.initials: JF
authors.lastname: Bermejo-Martin
authors.forename: Raquel
authors.initials: R
authors.lastname: Almansa
authors.forename: Raul
authors.initials: R
authors.lastname: Ortiz de Lejarazu
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015897:Comorbidity; D006801:Humans; D016867:Immunocompromised Host; D064766:Influenza A Virus, H7N9 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000276:immunology / Q000821:virology*; D008875:Middle Aged; D012307:Risk Factors