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Digital technology applications for contact tracing: the new promise for COVID-19 and beyond?


Among the most critical strategies in the fight against the Corona Virus Disease (COVID-19) is the rapid tracing and notification of potentially infected persons. Several nations have implemented mobile software applications (“apps”) to alert persons exposed to the coronavirus. The expected advantages of this new technology over the traditional method of contact tracing include speed, specificity, and mass reach. Beyond its use for mitigating and containing COVID-19, digital technology can complement or even augment the traditional approach to global health program implementation. However, as with any new system, strong regulatory frameworks are necessary to ensure that individual information is not used for surveillance purposes, and user privacy will be maintained. Having safeguarded this, perhaps the global health community will witness the beginning of a new era of implementing mass health programs through the medium of digital technology.


On 30 January 2020, the World Health Organization (WHO) [1] declared the novel pneumonia-like disease caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) a Public Health Emergency of International Concern (PHEIC). Approximately 6 weeks later, the WHO determines this outbreak to be a global pandemic. Per official reports on 8 May 2020, the new coronavirus disease (officially termed COVID-19) has been responsible for 3,866,642 total confirmed cases and 270,118 global deaths [2]. As the world battles the COVID-19 pandemic, contact tracing has been critically important among the repertoire of solutions to help “flatten the curve” of coronavirus infections. This commentary discusses the emerging use of digital health technology for the purpose of COVID-19 contact tracing, the latent benefits of adopting this model into other areas of global health, and the urgency of robust local and international data protection regulatory frameworks.

Conventional method of contact tracing

Contact tracing is a monitoring process for individuals who have been exposed to someone infected with a virus, and are at higher risk of infecting themselves and others [3]. The process involves three basic steps, namely contact identification, where the infected person recalls activities and the roles of persons involved since the onset of the infectious disease; contact listing, which provides the names of potentially infected contacts, and contact follow-up, to monitor any onset of symptoms associated with the viral infection [3].

Contact tracing has conventionally been implemented by an “Investigation Team” through an iterative process of interviews with the case, or if unable to talk or death has occurred, then with his or her family members [4]. The team proceeds to locate and notify all persons identified as contacts with the infected person. This investigative method of contact tracing may be inherently challenging in that it poses a logistical burden on the Investigation Team, is time consuming, and potentially stigmatizes the contacts and their associations who may wish to maintain the private status of their infection.

Emerging use of digital technology for COVID-19 contact tracing

The phenomenon of commissioning mobile software technology for contact tracing is not unusual. In 2010, a consortium of researchers in the United Kingdom allowed users to install a mobile software application called the FluPhone [5] to anonymously collect information on social encounters using Bluetooth, GPS coordination, and self-reported data. Successively, this information aided in developing predictive models of the influenza virus transmission patterns within each community.

Amid the COVID-19 outbreak, as many as 25 countries [6] (Table 1) across the globe have embraced digital technology as an aggressive measure to combat the spread of the coronavirus.

Table 1 Worldwide implementation of digital health technology for COVID-19 contact tracing

The common approach to this new infrastructure involves the usage of Bluetooth and application programming interfaces (APIs) provided by Google and Apple to enable interaction between mobile devices in close proximity. Bluetooth communication features in iOS and Android devices will assign a unique, anonymous identification code for all contacts in close proximity of a person’s device. Upon consent, if one tests positive for COVID-19, the app downloads a history of these identification codes for public health authorities to notify the close contacts in an effort to break the chain of transmission.

Extensive benefits of digital infrastructure application for global health

For some global health experts, the use of digital technology in the context of COVID-19 marks the ushering in of a promising new milestone in the implementation of mass interventions. Besides contact tracing, diverse digital infrastructure taking the form of Internet of Healthcare Things (IoHT), big data, and machine learning have played intergral roles in the efficient prevention and management of the new SARS-CoV-2 disease [7, 8]. Present applications of this technology are expanding to include the development of precision treatments for patients with COVID-19, streamlining of clinical workload, drug and vaccine discovery efforts, and predictive analytics to forecast the trajectory of outbreaks [7, 8].

Broadly considered, digital and AI-based interventions for global health replicate the basic principles of health programming in key ways. Fundamentally, it respects individual autonomy through opt-in/opt-out features which allow target populations to indicate or refuse consent to participate. Secondly, digital technology minimizes the burden of participation by eliminating the need for continuous self-reporting. Thirdly, automated processes circumvent any recall bias from the infected person, in addition to other potential human errors and gaps in data reporting. Lastly, and perhaps most important for the infected persons is the advantage of reducing the stigmatizing effect of face-to-face interviews with the official contact tracing Investigation Team.

Recommendations on regulatory frameworks for data privacy and protection

Despite the promise of digital interventions for global health, precautionary measures must be responsibly exercised. Governing authorities are to ensure that policy frameworks include strong protections for the privacy of users. By the same token, international or national laws should guarantee that data collected in the interest of public health are not ulteriorly used for retaliatory or surveillance purposes.

Established norms and principles governing digital technology and telecommunications also matter in the “context of international security” [8]. With growing internet use, criminal activity by hackers have frequently targeted vital State and civilian information in the cyberspace. Moreso in extreme cases, such as international armed conflicts, direct attacks on digital infrastructure enabling the delivery of public services can cause deliberate harm. Thus international humanitarian laws ought to be amended to govern responsible State behavior concerning civilian information available in the cyberspace. International laws should oblige States to enact protective measures to prevent cyberattacks on digital infrastructure [9].

Of critical note, it is recommended that at the design stage digital program implementation specialists carefully consider any potential threats against the proper inclusion of vulnerable populations. Preventive measures against the exploitation of these populations may incorporate the simplification of consent language or the availability of audio/visual translations for handicapped persons.


Digital technology together with AI and mass data have arrived in full force at the doorsteps of global health in the ongoing fight against the COVID-19 pandemic. With support from national governments, these technology applications serve as an alert system for enabling rapid contact tracing and notification as well as mass reach to the population. For epidemiologists and behavioral scientists, the mass data harvested from these digital platforms present an immense repository of evidence that can be beneficial in informing preparative steps for future pandemics. Beyond its use for mitigating and containing COVID-19, digital technology can complement or in some cases amplify the traditional approach to global health program implementation. However, as with any new system, extra measures such as privacy protection, and skills training for specialists, are warranted to avoid blindspots which could overshadow the benefits.

Availability of data and materials

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Corona virus disease 2019


Application programming interfaces


Artificial intelligence


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Special thanks to the reviewers for their helpful comments.


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The commentary was conceived and written in its entirety by PNO. The author(s) read and approved the final manuscript.

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Priscilla N. Owusu, ScM is a doctoral researcher at the Heidelberg University Institute of Global Health in Germany. Her research focuses on the epidemiology of mental health, with other interests in applying digital technology into health interventions.

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Correspondence to Priscilla N. Owusu.

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Owusu, P.N. Digital technology applications for contact tracing: the new promise for COVID-19 and beyond?. glob health res policy 5, 36 (2020).

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