What could be going on? Infants (ages 0-1) are a new cohort each year, with little acquired immunity. They also aren't drivers of transmission. It's likely that the infection rate in infants simply reflects prevalence in older children and younger adults (families). 6/
The hospitalization rate in infants is similar to (or a little lower than) last summer. It seems plausible that this reflects prevalence which is normal for a summer wave. 7/
In which case, severe disease is down for those with acquired immunity (vaccinations and/or prior infections). This is a hypothesis at this point, and needs more observations. But worth watching. 8/8