http://stanmed.stanford.edu/2014fall/brain-attack.html
Here's a bit:
"Children who meet diagnostic criteria for PANS have sudden, severe obsessive-compulsive behavior or anorexia, along with so many other problems that the child can barely function. These may include separation anxiety so powerful the child cannot bear to be more than a few feet from a parent, bizarre inhibitions about food, deterioration in schoolwork, intense insomnia or, as the Nelsons observed in Paul Michael, violent rages when the child’s obsessions cannot be satisfied.
“In some ways, it’s like having your kid suddenly become an Alzheimer’s patient, or like having your child revert back to being a toddler,” says Jennifer Frankovich, MD, clinical assistant professor of pediatric rheumatology at the School of Medicine and one of the clinic’s founders.
“We can’t say how many kids with psychiatric symptoms have an underlying immune or inflammatory component to their disorder, but given the burgeoning research indicating that inflammation drives mood disorders and other psychiatric problems, it’s likely to be a large subset of children and even adults diagnosed with psychiatric illnesses,” says Kiki Chang, MD, professor of psychiatry and behavioral sciences."