Like a growing number of teenagers in the United States, Ethan Lindenberger reached the age of 18 without receiving most government-recommended vaccines.
"God knows how I'm still alive," he wrote online in November, explaining that his mother believed the injections caused brain damage and autism.
Approaching his 18th birthday, when he would no longer need parental consent, Ethan made a major decision - he would defy his mother and get vaccinated. "I had done the research and I believed I was doing what was best for me," he told The Sunday Telegraph.
Ethan's tale made national headlines, leading to him giving evidence to Congress in an emotional testimony. But his story if far from unique.
The US is on track for its worst year for measles in a quarter century, as pseudo science conjured up by anti-vaccination groups spreads among anxious parents through social media.