title: Pre-existing immunity in human challenge studies of influenza transmission.
authors.forename: Julian W
authors.initials: JW
authors.lastname: Tang
mesh_terms: D004196:Disease Outbreaks / Q000517:prevention & control*; D006801:Humans; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission*; D009975:Orthomyxoviridae