At 14, Alyssa Flanagan’s asthma symptoms all but disappeared.
Since the age of 4, she had been hospitalized a few times each year -- once in the intensive care unit - when her colds turned into coughing, wheezy pneumonias. Asthma loomed large in her life.
“The simplest explanation is that I’ve outgrown it, or for some reason, there was an immune trigger that’s not present anymore,” says Flanagan, now a 30-year-old medical resident at the University of Illinois-Chicago.
Flanagan says she’s aware...