My son has to take antibiotics continuously because of an autoimmune reactions to strep (called PANDAS).

https://www.nimh.nih.gov/health/publications/pandas/index.sh...

Symptoms from the above link:

Presence of obsessive-compulsive disorder and/or a tic disorder Pediatric onset of symptoms (age 3 years to puberty) Episodic course of symptom severity (see information below) Association with group A Beta-hemolytic streptococcal infection (a positive throat culture for strep or history of scarlet fever) Association with neurological abnormalities (physical hyperactivity, or unusual, jerky movements that are not in the child’s control) Very abrupt onset or worsening of symptoms