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181   $ctxt$2rdacontent
182   $cc$2rdacontent
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200 10$aExposure notification $ebenefits and challenges of smartphone applications to augment contact tracing: report to congressional addressees
210  1$aWashington, DC :$cUnited States Government Accountability Office,$d2021.
215   $a1 online resource (iii, 54 pages) $ccolor illustrations, color map
300   $a"September 2021."
300   $a"GAO-21-104622."
320   $aIncludes bibliographical references.
517   $aExposure notification 
606   $aCOVID-19 (Disease)$zUnited States$xPrevention
606   $aCOVID-19 (Disease)$xTransmission$zUnited States
606   $aContact tracing (Epidemiology)$zUnited States
606   $aPublic health surveillance$zUnited States
606   $aSmartphones$zUnited States
606   $aMobile apps$zUnited States
606   $aElectronic surveillance$2fast
607   $aUnited States$2fast
615  0$aCOVID-19 (Disease)$xPrevention.
615  0$aCOVID-19 (Disease)$xTransmission
615  0$aContact tracing (Epidemiology)
615  0$aPublic health surveillance
615  0$aSmartphones
615  0$aMobile apps
615  7$aElectronic surveillance.
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996   $aExposure notification$93521347
997   $aUNINA