This review of six studies found that rates of Obsessive Compulsive Disorder (OCD) had increased during the COVID-19 pandemic and that being in treatment was protective for young people. 

Cunning C, Hodes M. The COVID-19 pandemic and obsessive–compulsive disorder in young people: Systematic review. Clinical Child Psychology and Psychiatry. 2022;27(1):18-34. doi:10.1177/13591045211028169

https://journals.sagepub.com/doi/full/10.1177/13591045211028169