title: Re: "The effect of disease prior to an outbreak on estimates of vaccine efficacy following the outbreak".
authors.forename: C P
authors.initials: CP
authors.lastname: Farrington
mesh_terms: D015982:Bias; D004196:Disease Outbreaks / Q000517:prevention & control*; D006801:Humans; D015994:Incidence; D015233:Models, Statistical; D009017:Morbidity; D013997:Time Factors; D014611:Vaccination / Q000592:standards*