2000j-296 acquiredimmunodeficiencysyndrome aids(disease) communicablediseasecontrol communicablediseases congresses control developingcountries governmentpolicy history hiv(viruses) hivinfections host-virusrelationships htlv(viruses) htlvviruses humanexperimentation humanexperimentationinmedicine immunizationprograms immunologicalaspects immunology medicalethics models moralandethicalaspects moralandethicalaspectsofhumanexperimentationinmedicine prevention publicpolicy research testing theoretical unitedstates wc503