There is a decades long observation about strep toxins and neurological symptoms. I had tics for two years after a series of a half dozen strep infections. Also, antibiotics are commonly used to treat ulcers now, a formerly psychiatric disorder....
What Frankovich, a pediatric rheumatologist, and Dr. Kiki Chang, a child psychiatrist, concluded was that Tessa likely had an infection or other trigger that caused her immune system to mistakenly attack her brain, dramatically changing Tessa’s behavior overnight. It’s a condition called PANS — pediatric acute-onset neuropsychiatric syndrome — that in some cases, if caught early enough, could be cured by commonly used antibiotics. Without early treatment, they say, children can suffer needlessly.