REACT: Real-time Contact Tracing and Risk Monitoring via ...
REACT: Real-time Contact Tracing and Risk Monitoring via Mobile Tracking
(NSF RAPID Award)
Li Xiong, Computer Science, Emory University Cyrus Shahabi, Computer Science, University of Southern California
Project Team
Emory University Li Xiong (CS and Biomedical Informatics) Vicki Hertzberg (Nursing) Lance Waller (Public Health)
University of Southern California Cyrus Shahabi (CS, ECE, and Spatial Sciences)
University of Texas Health Science Center Xiaoqian Jiang (Biomedical Informatics) Amy Franklin (Biomedical Informatics)
Outline
? Project overview ? Privacy challenges and opportunities
Contact Tracing
? The incubation period is the time between infection and onset of symptoms ? COVID-19: mean 5.5 days, median 5.2 days, standard deviation 2.1 days1
? The generation time is the time between the infection of the source and the infection of the recipient. ? COVID-19: mean and median equal to 5.0 days, standard deviation of 1.9 days2
? For COVID-19, the incubation period is longer than generation time, so an infected person can transmit while pre-symptomatic
? Contact Tracing: interviewing a confirmed case (usually already symptomatic) to identify (and alert) his/her close contacts in the past x days (x=incubation time + symptomatic time; for COVID-19 14 days)
? Pluses: fomite transmission, indirect transmission
? Challenges: patient recall from memory, scale-up, latency ? Digital contact tracing: using mobile phones ? promises to address all
Source: L. Ferretti et al., Science 10.1126/science.abb6936 (2020).
1. S. A. Lauer, K. H. Grantz, Q. Bi, F. K. Jones, Q. Zheng, H. Meredith, A. S. Azman, N. G. Reich, J. Lessler, The incubation period of 2019-nCoV from publicly reported confirmed cases: Estimation and application. medRxiv 2020.02.02.20020016 [preprint]. 4 February 2020.
2. L. Ferretti et al., Science 10.1126/science.abb6936 (2020).
Contact Tracing Apps (more than 50)
Contact-tracing Applications
Software Ready
Adoption ready
Privacy focus
Bluetooth
GPS
QR
iOS & Android
Open Source
Covid Community Alert
yes
yes
yes
OpenTrace
(Singapore
yes
Govt.)
Coalition (Nodle)
yes
Private Kit: SafePaths (MIT)
alpha
DP3T (EPFL and others)
alpha
CovidSafe (UW, Microsoft)
alpha
Zerobase
alpha
support needed
partial
yes
yes
no
yes
no
yes
no
yes
no
yes
yes opt-in no yes yes
yes no no yes yes
yes no no yes no
yes yes no yes yes
yes no no yes yes
yes
yes
no
Android only
yes
no
no yes yes yes
medical certificate
support
yes
no
unclear unclear
yes unclear
no
non Centralize Server Adoption profit d Logging code status
Web-link
Brazil
yes
yes
yes
(under control.github.io/web/index.html
on)
yes
yes
yes
Singapore, community
no (app free)
no
unclear
unknown
/
yes
yes unclear prototype
yes
no
yes unknown
yes
yes
yes
prototype
. edu/
yes
yes
yes prototype
*Table courtesy of Prof. Bhaskar Krishnamachari
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