What is PANDAS, the disorder some doctors say can cause extreme behavioral changes in kids? – ABC

Alexia Baier was an eager-to-learn, 4-year-old girl beginning pre-K in a suburb outside of Chicago. She thrived academically — counting, painting and playing with other children.

But five months after starting pre-K, she was infected with a bacteria that several millions of people get every year, according to the Centers for Disease Control and Prevention. The bacteria, group A strep, caused Alexia to get strep throat, a condition children usually recover from easily with treatment.

ABC News-2018