One of the things that I don't think we are doing a good job of here in Canada is promoting our COVID Alert app. Most of the people I talk to don't seem to have it installed on their phones. And most of the people I talk to seem to be nervous about sharing personal information with it, including their location. (That's not actually how the app works.)
The thing with exposure alert apps is that they're only really useful if most people are using them. And they're only really useful if people who test positive for the virus enter the code that they are given into the app. So it relies on us trusting that other people will do the right thing. I get that. But those same shortcomings apply when we just ask someone if they've been exposed to anyone with COVID-19.
I could be wrong, but my view on this is pretty simple.
If everyone who had COVID-19 got immediately sick and showed highly discernible symptoms, then this virus would likely be a lot easier to control. Part of the problem, as I understand it, is that some people get really sick and some people don't get sick at all. But these latter people can still unknowingly spread it around -- perhaps to other people who might get really sick.
Given this variability, it's critical for us to know who has been potentially exposed and who has not been exposed. Otherwise, we're running around mostly blind. From what I can tell, exposure alert apps are one of the best ways for us to track transmission. But, of course, it only works if you've got the app. For those of you who don't already have it, you can download it for both iOS and Android by going here.
P.S. I'm writing this post because it came up with my barber today while I was getting a haircut. He wasn't all that aware of the app, but he ultimately concluded that we have a problem of education and that he was going to download it. Maybe some of you will do the same after reading this.
I installed and setup Health Canada's COVID Alert app this morning.
It's really simple to do that. You don't enter any personal information. You just select which province you're in, agree to let it use your Bluetooth, and give it permission to share the random codes that you collect with its servers (more on this below). The app is then active and working. But to be clear, it doesn't collect your location (it doesn't use GPS or location services). It doesn't collect the places or times that you are next to someone who also has the COVID Alert app. And it doesn't know if you're with someone who was previously diagnosed with COVID-19.
Built on top of the private exposure framework that was collectively developed by Apple and Google, the app works by using Bluetooth to exchange "random codes" between nearby phones that have the app. These are anonymous and random codes that are used to track which phones have been next to which phones for any meaningful period of time. The app also uses Bluetooth signal strength to estimate proximity. So it knows how long your phone has been proximate to someone else's (with the app) and how close they got to each other.
That's pretty much all that happens with the app unless you test positive for COVID-19. At that point, you will be given a one-time key along with your diagnosis. The onus is then on you to anonymously self-report on the app. Once you do that, anyone who was exposed -- i.e. next to your phone in the last 14 days -- will receive an alert on their phone via the app. And since the app doesn't know any names or who anybody is, it's of course all completely anonymous.
It's great to see all of this coming together. The private sector worked to build the underlying framework and now you have government building on top of it to deliver public health tools. I know that some or many of you will be concerned about privacy, but that appears to have been very well thought out. If you haven't already downloaded the app, I would encourage you to check it out. It's available for iOS and Android and can be downloaded over here.
The “contact tracing” API that Apple and Google are working on and that I wrote about earlier this month is set to be released on May 1. Given all the concerns around privacy, it’s now being referred to as “exposure tracing.” The idea, here, is to emphasize that it is being designed to trace the coronavirus and not individuals.
To be clear, we’re talking about APIs, and so third party apps will need to be built on top of this tech before we can start downloading anything to our phones. But I am sure that will happen very soon and I will gladly opt in.
It’s also worth mentioning that this entire concept of smartphone exposure tracing only works when Apple and Google cooperate. Whatever apps ultimately get built need to work across both platforms, otherwise there would be far too many gaps in the network. So this — along with the focus on privacy — has become a bit of good PR for “big tech.”
The smart people working on exposure tracing over at Oxford University seem to think that (alongside other interventions) we could stop this virus with only about 60% of the population using an exposure tracing app. (They ran models with a pretend city of 1 million people.) But even at 50% penetration, they believe it could make a meaningful contribution.
These are numbers I think we could easily get to in major cities. Overall, I suspect it could also make people feel a lot more comfortable about going out. And going out is what’s going to be required as we gradually reopen the global economy. How many of you think you will opt in to something like this once it becomes available?