Social restrictions and hygiene requirements implemented during the coronavirus disease 2019 (COVID-19) may trigger an increase in obsessive-compulsive disorder (OCD) in children and adolescents, according to an analysis of Danish children. During April and May 2020, about 44.6% of 65 Danish children and adolescents surveyed in a clinical group reported increased OCD severity related to COVID-19 (including symptom intensity, anxiety, depressive symptoms, and avoidance behavior). OCD is defined as a psychiatric disorder characterized by frequent unwanted thoughts, images or urges, and repetitive behaviors or mental acts which occur in response to an experienced anxiety, or in . . .