This is my first time on the forum, and I'm thrilled by all the discussion . . . several heads are better than one!
My son was diagnosed with OCD more than 6 years ago; through some web research, I'd come across PANDAS and asked both the doctor about it. He dismissed it quickly, saying that the research (at least at that time) was not conclusive; when we added a psychiatrist to the mix a couple of years later, he, too, dismissed it. Said he'd actually had a conversation with Swedlow (the NIMH doctor who'd led the pre-eminent PANDAS study) and she'd basically said that strep tests should not be standard protocol for children presenting with OCD.
So we went 6 years treating the OCD the standard way: therapy and SSRI's. But at 12, the behaviors went off the charts, and he didn't respond to anything. I found Beth Maloney's book "Saving Sammy" and decided, again, to press the PANDAS issue with our doctors. They finally relented, I think more to shut me up than because they believe it to be real. So, we've been off and on antibiotics for the last several months; every time we go on, we get positive results. Every time we come off, the behaviors start up again, so we go back on. Before we started the first course of antibiotics, we had his ASO strep titers tested, and the count was 438, nearly double the normal range.
So, while my son is not an adult, he's not exhibiting OCD for the first time, and he's still responding to antibiotics. My husband also suffers from anxiety and OCD, and he had multiple strep infections as a kid. We've talked about having his titers tested to see if they are elevated, but haven't taken that step yet as both his anxiety and OCD are more manageable on a daily basis than are my son's.
I would be REALLY interested to hear about adults who a) get titer tests and find they have elevated levels despite no recent strep infection, and those who, even as adults, start antibiotic treatment and receive some relief. That would blow much of the existing PANDAS criteria away, especially with respect to its treatment.