title: [Vertical or circumstantial transmission?].
authors.forename: José Luis
authors.initials: JL
authors.lastname: Sandoval Gutiérrez
mesh_terms: D006801:Humans; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000635:transmission*