01904oam 2200565 450 991071717250332120220218095509.0(CKB)5470000002528489(OCoLC)1283923832(OCoLC)1267994307(OCoLC)995470000002528489(EXLCZ)99547000000252848920211005d2021 ua 0engur|||||||||||txtrdacontentcrdacontentcrrdacarrierExposure notification benefits and challenges of smartphone applications to augment contact tracing: report to congressional addresseesWashington, DC :United States Government Accountability Office,2021.1 online resource (iii, 54 pages) color illustrations, color map"September 2021.""GAO-21-104622."Includes bibliographical references.Exposure notification COVID-19 (Disease)United StatesPreventionCOVID-19 (Disease)TransmissionUnited StatesContact tracing (Epidemiology)United StatesPublic health surveillanceUnited StatesSmartphonesUnited StatesMobile appsUnited StatesElectronic surveillancefastUnited StatesfastCOVID-19 (Disease)Prevention.COVID-19 (Disease)TransmissionContact tracing (Epidemiology)Public health surveillanceSmartphonesMobile appsElectronic surveillance.S2HS2HDIDOCLCFGPOOCLCOGPOBOOK9910717172503321Exposure notification3521347UNINA