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215   $a1 online resource (2 pages) $ccolor illustrations
225 1 $aScience & tech spotlight
300   $a"July 2020."
300   $a"GAO-20-666SP."
320   $aIncludes bibliographical references (page 2).
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606   $aCOVID-19 (Disease)$xTransmission
606   $aContact tracing (Epidemiology)
606   $aPublic health surveillance
606   $aSmartphones
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606   $aPublic health surveillance$2fast
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615  0$aCOVID-19 (Disease)$xTransmission.
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615  0$aPublic health surveillance.
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615  7$aCOVID-19 (Disease)$xPrevention.
615  7$aContact tracing (Epidemiology)
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615  7$aSmartphones.
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