OPINION | There's still hope for contact tracing in SA

  • Contact tracing is the process of identifying contacts of a person who tests positive for Covid-19 so that the contacts can be notified that they have been exposed. 
  • Timing is of the essence: The shorter the delay between identifying a positive case and identifying their contacts, the easier to contain the disease. 
  • SA has thus far struggled with contact tracing, but the author says there's still hope. 

"The storm", to use Minister of Health Dr. Zweli Mkhize’s words "is now arriving." It hit the Western Cape first before moving on to the Eastern Cape and Gauteng.

The big question is: are we ready for it? Did we buy enough provisions and batten down all hatches? I fear the answer is a resounding "no". There are some provisions we simply couldn’t buy because they are not available—sufficient test kits and ventilators—but some hatches were left wide open by our policymakers and contact tracing is probably the largest of them.

Countries like Germany with their Corona Warn App, which informs users about a potential exposure to Covid-19 are leading the way.

Meanwhile, in Mzansi, the Department of Health is trying to sell a chatbot as a new tool for contact tracing. COVID Connect, developed by the Praekelt Foundation and BCX, makes it a little easier for users to provide the information of close contacts, but at the cost of the crucial contact tracing interview which can establish the context of an exposure.

What is contact tracing and why does it matter?

We know since the 1970s that the most potent connections for contagion are "weak links", for example when sitting next to a perfect stranger in a taxi filled to capacity.

Contact tracing is the process of identifying contacts of a person who tests positive for Covid-19 so that the contacts can be notified (either manually or digitally) that they have been exposed to someone who has tested positive and should, consequently, self-isolate. The effectiveness of this has been shown in recent work by Oxford researchers, who asked how many contacts of how many symptomatic Covid-19 patients need to be notified in order to curb the spread of the virus.

The Oxford team finds that timing is of the essence: If there is no delay between the identification of a positive case and the notification of all their contacts, then we need to identify about 50% of all positive cases and notify about 60% of their contacts to contain the disease. If we have a two-day delay between identification of a positive case and notification of the contacts, roughly 80% of all contacts need to be notified.

This is the crux of the matter in South Africa. While the contact tracing process is designed to be largely digital in industrialised countries, South Africa is using an almost entirely manual – and therefore slow – process. Given our country’s low smartphone penetration rate of only about 50%, it is understandable that we do not rely on smartphone technology alone, but alternatives are available.

Since early March, a team of researchers at the University of Cape Town, together with South African entrepreneurs, built Covi-ID, a free and open source contact tracing solution specifically designed for users without smartphones.

We have attempted to engage with government officials regarding a privacy-preserving contact tracing solution for South Africa. Unfortunately, the one attempt the South African government had at digital contact tracing – using geolocation data from cell phones via triangulation of the phone’s position – has been unsuccessful and rightly scrapped.

It was clear from the beginning that the system would not work, because it locates phones only within a 400m radius in an urban setting. In a township, however, there are easily 5 000 people within that radius. The next attempt has been contact tracing via chatbot, which is equally unlikely to succeed.

No contact tracing – what does it mean?

If we accept the reality that there is only manual contact tracing in South Africa, what are the consequences? Here are three questions to help us understand the answer.

First, the most pressing question that everyone should ask our policy makers: Have you accepted that the virus will spread through large parts of our population or do you intend to contain it?

Health Minister Zweli Mkhize early on spoke about most of the population becoming infected, making it seem inevitable. Implicitly, he has set us on the path of Sweden, but without our government having the guts to step in front of the South African people and explain why they think this is the best way forward.

Instead, we are being told that we all have to make sacrifices in order to flatten the curve, meaning we sacrifice to give the health system time to build resilience and capacity. Surely, this was necessary, but what Mkhize says is less important than what he does not say. Flattening the curve alone, without other measures, will buy us time, but doesn’t actually solve the problem.

Other countries show that with the right set of tools, it is possible to contain the virus and we should not accept that the South African government—including the provincial government in the Western Cape—do not pursue the most effective option to actually contain the virus.

The next question, then, is: Are the relaxed lockdown measures effective and do they achieve what they set out to achieve? If not, should we relax restrictions even further or should we go back to Level 5? The answer to this question strongly depends on the answer to the first question.

If we don’t actually plan to "contain" the virus—limit its spread before it reaches a large part of the population—the only reason to go back to Level 5 is to slow down the spread and give our health system time to build capacity.

Finally, the third important question is: If we do not intend to contain the virus, how likely are we to see a second or third wave? The answer is tricky, because it is intuitive to think that we will be spared by future outbreaks because those who already have contracted the virus are unlikely to get it again. The problem is that this is far from clear. The virus mutates and, while mutations tend to be more benign (except in movies), we might see future outbreaks of similar viruses—Covid-19 might become part of our life. What is more, having a functioning contact tracing system might prove to be a piece of critical infrastructure, similar to a country’s payment system or mobile networks.

Building an effective national contact tracing solution could be a huge opportunity for the country, not just in the fight against Covid-19, but also to create a thriving new ecosystem for healthcare services in Africa. Instead of building infrastructure, we got a glorified chatbot. Poor South Africa.

Co-Pierre Georg is Associate Professor at UCT's School of Economics. Views expressed are his own.

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