Initially, people were very happy to take any vaccine dose, including those with a short shelf life. There was enormous demand, and people would take them and use them very quickly. What's happened since is that countries have now gotten access to vaccines. With those vaccines being in country, they have planned programs and are working on it. If doses show up that have a short shelf life, they have to either displace the doses that they have planned to use or they have to return those short-shelf-life vaccines.
Some have displaced the vaccines they were planning. Some have rejected them. Of course, if it's coming through COVAX, we don't provide those doses without first asking whether they'll take them, including what the timeline is, but some donors have provided vaccines outside of COVAX with short shelf life and put political pressure on countries to take them. This has meant, if they have short shelf life, that they have to go ahead and push out their other vaccines, which may create problems with those.