"I haven't had anyone that's been fully vaccinated become critically ill," said Dr. Josh Denson, a pulmonary medicine and critical care physician at Tulane University Medical Center in New Orleans. It's been the same for Dr. Ken Lyn-Kew, a pulmonologist in the critical care department at Denver's National Jewish Health: "None of our ICU patients has been vaccinated." Unvaccinated children, too, seem to be at increased risk for severe illness. "In our local hospitals, the kids that are getting sick are the ones that are not vaccinated," said Dr. Natasha Burgert, a pediatrician in Overland Park, Kansas, and a national spokesperson for the American Academy of Pediatrics.