title: Field evaluation of vaccine efficacy.
mesh_terms: D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology; D006801:Humans; D008457:Measles / Q000517:prevention & control; D011785:Quality Assurance, Health Care; D014612:Vaccines / Q000592:standards*
chemical_list: D014612:Vaccines