As we've noted, a number of factors are contributing to it. We have seen a more sustained level of viral infections in children, above the normal level. These are from COVID and other respiratory viruses that have increased in the fall, with respiratory syncytial virus, influenza starting now, and COVID as well.
Another dimension is that as people became more aware—and there was some communication on this in August, as Dr. Sharma noted—increased buying contributed to the demand.
It was a number of factors, but an unusually significant viral infection season impacting children has certainly been a major cause and one which we're very focused on addressing. Certainly we're doing everything we can to support children, infants and their parents and caregivers.