title: Assessing vaccine efficacy in the field. Further observations.
authors.affiliation: Division of Immunization, Centers for Disease Control, Atlanta, GA 30333.
authors.forename: W A
authors.initials: WA
authors.lastname: Orenstein
authors.forename: R H
authors.initials: RH
authors.lastname: Bernier
authors.forename: A R
authors.initials: AR
authors.lastname: Hinman
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D011358:Product Surveillance, Postmarketing / Q000379:methods*; D014611:Vaccination; D014612:Vaccines / Q000592:standards*
chemical_list: D014612:Vaccines