Rob Wiblin

So just to have a picture in the head of the magnitude of the benefit, you're saying it increases vaccination rates by 10 percentage points, and that's about 27%.

So huge magnitude.

How large is the SMS reminder effect again, separately?

Three and seven percent.

Okay.

So I'm guessing the SMS reminders are a bunch cheaper because you're just sending texts.

And I guess they're probably easier to scale as well because you just have to get a bunch of phone numbers and then stick them in some piece of software that sends out text messages.

On the other hand, it seems like the ambassadors have a larger effect size, maybe a more robust result in the RCT.

How are you going to trade off this like easiness of scalability and low cost?

In the original version, people would go to the village.

Exactly.

Maybe I've got the wrong picture in my head here.

So the SMS is pretty easy to scale, but I guess you have to get the numbers, you've got to get permission to do it, and you've got to put them through the software, clean up the data and so on.

But it sounds like, in fact, getting some ambassadors from these villages is not that hard at all because you're making a bunch of phone calls, getting some names, and then you call them up and you're not putting them through some difficult training process.

You're kind of just asking them, could they do this?

And it might be a relatively fast conversation.

And then potentially you've covered a whole village, right?

Maybe I was kind of asking this earlier, but I kind of want to ask again because I think it's just kind of important.

It seems like parents don't want their kids to die and the benefits of vaccinations are really big and the parents don't object to vaccinations.

What's going on that's causing the parents not to really prioritize as a really high priority, making sure that their kids get the later vaccinations?