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... Why it matters: It's another reminder that diseases once thought to have been eradicated are showing up with increased frequency in clinics and ERs, posing challenges for younger physicians and health workers who thought they were relegated to history.

- - - Lingering vaccine hesitancy and distrust of the medical establishment stoked by Health Secretary Robert F. Kennedy Jr. are leading some health systems to add training on old scourges that were practically wiped out by immunization campaigns and increased surveillance.

"You're taught these things in medical school, and you're taught from a very academic perspective with the sense of measles was eradicated in 2000," said Nicholas Cozzi, EMS medical director at Rush.

- - - "Now we're having a resurgence, the highest in 25 years, and you might have not reviewed that since the first year of medical school," he added. "It's a new paradigm and a new normal that we have to adapt to."

The big picture: The focus is particularly acute on childhood illnesses such as measles, chicken pox, invasive strep pneumoniae and pertussis, experts told Axios. ...