UNICEF's supply division is the lead delivery agency for COVAX. That means we are part of the procurement process and of delivery in literal terms, transporting or shipping and flying vaccines to countries. In fact, there is no problem with doing that.
I think there has been a misunderstanding. When we say “delivery challenges”, we don't mean transport problems. Often, the turnaround time between receiving doses, getting them on a plane and delivering them to a country can be as little as 48 hours. There's no constraint in terms of the transportation.
The process involves a country being ready to receive and accept doses. UNICEF will never deliver doses that are ready to be deployed if they can't be accepted by a country and turned into vaccinations received in people's arms. Each country must, of course, tell us it is ready to go before we will deliver vaccines. This is in order to prevent wastage, precisely as we've been discussing.
One way of thinking about it is that we're acting as a matchmaker between available supplies from donors or manufacturers and the receiving countries. As a matchmaker, we have an extremely high success rate. When countries are not able to take those vaccines and deploy them—rejecting them due to short shelf life, or because they simply haven't been able to mobilize a workforce that is ready to go—they will decline. Wherever possible, we'll redirect those vaccines to another country that is ready to deploy them.
Unfortunately, sometimes that does result in waste. Obviously, we aim to minimize that. Thus far it's been very low.