Objective: Disease containment of COVID-19 has necessitated widespread social isolation. We aimed to establish what is known about how loneliness and disease containment measures impact on the mental health in children and adolescents. Method: For this rapid review, we searched MEDLINE, PsycInfo, and Web of Science for articles published between January 1, 1946, and March 29, 2020. Of the articles, 20% were double screened using predefined criteria, and 20% of data was double extracted for quality assurance. Results: A total of 83 articles (80 studies) met inclusion criteria. Of these, 63 studies reported on the impact of social isolation and loneliness on the mental health of previously healthy children and adolescents (n ¼ 51,576; mean age 15.3 years). In all, 61 studies were observational, 18 were longitudinal, and 43 were cross-sectional studies assessing self-reported loneliness in healthy children and adolescents. One of these studies was a retrospective investigation after a pandemic. Two studies evaluated interventions. Studies had a high risk of bias, although longitudinal studies were of better methodological quality. Social isolation and loneliness increased the risk of depression, and possibly anxiety at the time at which loneliness was measured and between 0.25 and 9 years later. Duration of loneliness was more strongly correlated with mental health symptoms than intensity of loneliness. Conclusion: Children and adolescents are probably more likely to experience high rates of depression and most likely anxiety during and after enforced isolation ends. This may increase as enforced isolation continues. Clinical services should offer preventive support and early intervention where possible and be prepared for an increase in mental health problems.

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Background: Teachers have a significant role to play in identifying children with mental health problems. However, teachersÕ perceptions of childrenÕs mental health problems are relatively unexplored. Method: Primary school teachers (N = 113) completed a questionnaire, composed of vignettes describing children with symptoms of a common emotional disorder and a common behavioural disorder, following which they were asked a number of questions regarding problem recognition and help-seeking. Results: Teachers were able to recognise the existence of a problem and rate its severity. They were significantly more concerned about a vignette of a child with symptoms of a behavioural disorder than an emotional disorder. The gender of the child was found to independently predict teachersÕ accurately recognising when a child had a problem. Conclusion: Teachers are good at recognising whether a child presents with a problem. However, their problem recognition is affected by both the gender of the child and the type of symptomatology being displayed (emotional versus behavioural). Key Practitioner Message:• Teachers were generally good at recognising the existence and severity of symptoms of problems (behavioural or emotional) presented by a child described in a vignette.• Teachers were significantly more concerned about a child with clinical-level symptoms of a behavioural disorder than a child with clinical-level symptoms of an emotional disorder.• Gender of the child portrayed also impacted upon teachersÕ accurate problem recognition.• It appears that teachers could benefit from further training to refine their ability to identify and act upon childrenÕs mental health problems in a timely manner, thus minimising the need for future intervention.

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