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10.1371/journal.pone.0250826

http://scihub22266oqcxt.onion/10.1371/journal.pone.0250826
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suck abstract from ncbi


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pmid33914810      PLoS+One 2021 ; 16 (4): e0250826
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  • Measurement-based evaluation of Google/Apple Exposure Notification API for proximity detection in a commuter bus #MMPMID33914810
  • Leith DJ; Farrell S
  • PLoS One 2021[]; 16 (4): e0250826 PMID33914810show ga
  • We report on the results of a measurement study carried out on a commuter bus in Dublin, Ireland using the Google/Apple Exposure Notification (GAEN) API. This API is likely to be widely used by Covid-19 contact tracing apps. Measurements were collected between 60 pairs of Android handset locations and are publicly available. We find that the attenuation level reported by the GAEN API need not increase with distance between handsets, consistent with there being a complex radio environment inside a bus caused by the metal-rich environment. Changing the people sitting in a pair of seats can cause variations of +/-10dB in the attenuation level reported by the GAEN API. Applying the rule used by the Swiss Covid-19 contact tracing app to trigger an exposure notification to our bus measurements we find that no exposure notifications would have been triggered despite the fact that all pairs of handsets were within 2m of one another for at least 15 mins. Applying an alternative threshold-based exposure notification rule can somewhat improve performance to a detection rate of 5% when an exposure duration threshold of 15 minutes is used, increasing to 8% when the exposure duration threshold is reduced to 10 mins. Stratifying the data by distance between pairs of handsets indicates that there is only a weak dependence of detection rate on distance.
  • |*Contact Tracing/methods[MESH]
  • |*Mobile Applications[MESH]
  • |*Transportation[MESH]
  • |COVID-19/epidemiology[MESH]
  • |Cell Phone[MESH]
  • |Humans[MESH]


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