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Sir Elton John has said he can't see his sons playing rugby after an infection last summer left him struggling with his eyesight.

An insidious but lesser-known consequence of even a mild measles infection is that it kills the very cells that remember which pathogens the patient has previously fought and how those battles were won.

"While I was there my bed sheets were changed just once in a week. My legs wouldn't stop oozing so the sheets were filthy. I was worried about picking up another infection."

However, two of the people were children; the cause of their infection has not been determined.

The center is one of several efforts to combat chronic illnesses stemming from infection affected by cuts made in the first few months of the Trump administration.