In May, 9% of hospitalizations were among the vaccinated. For hospitalized deaths, that number rose even more, from zero in January to 15.1% in May.

…

…there are more vaccinations now, and more vaccinations among at-risk populations such as immunocompromised or elderly persons. 

For those groups, though, the vaccine is less effective. The vaccine effectiveness against hospitalization is down to 59% for immunocompromised groups, and in the 70% range for nursing home residents.

…

Symptoms do appear worse with the delta variant. Health officials in other counties have reported higher odds of hospitalization – this comes from both Canada and Scotland – and in Singapore a higher need for oxygen intake.