title: Problems in vaccine development.
authors.affiliation: Department of Pediatrics, University of Pennsylvania , Philadelphia, Pennsylvania.
authors.forename: Stanley A
authors.initials: SA
authors.lastname: Plotkin
mesh_terms: D055808:Drug Discovery / Q000379:methods*; D006801:Humans; D007156:Immunologic Memory / Q000276:immunology*; D018448:Models, Immunological; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D014765:Viral Vaccines