[Arete31415]

Another one person data point:

I've had OCD since childhood, and even when I was a kid I noticed that sometimes my symptoms would flare up for a few days, right before I came down with the flu.

As an adult, I contracted Lyme Disease, and one lingering symptom was that my OCD got a lot worse. After 1 month of IV antibiotics (rocephin), my OCD went from a "10" down to maybe a 7 in severity.