@Iwillyeah This was about 15 years ago. Medical opinions have shifted (let me know if you want two fairly recent reports I saw - both U.S. based) it seems...from on board with strep as cause to more dubious but ..."let's treat symptoms". Both kids were students I only saw in the library once a week, but they were young (6ish?) and children I enjoyed talking to, so I noticed the OCD changes. Then their parents told me about PANDAS, which had been in the news a fair amount at the time.