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Competing Interests: Intérêts concurrents : Krista Baerg déclare avoir reçu du financement du Chronic Pain Network. Elle a été présidente sortante de la section de la pédiatrie communautaire de la Société canadienne de pédiatrie et membre du conseil d’administration de la Saskatchewan Pain Society; elle a reçu des droits d’auteur de Brush Education. Kevin Chan est président du Comité des soins aigus de la Société canadienne de pédiatrie. Elizabeth Donner est présidente du comité de recherche scientifique et administratrice d’Épilepsie Canada. Elle est aussi membre de Partners Against Mortality in Epilepsy et de comités consultatifs pour Cardiol, Pendopharm et Stoke Therapeutics. Catherine Farrell est présidente du comité directeur scientifique du Programme canadien de surveillance pédiatrique, ancienne présidente du Comité de spécialité en pédiatrie du Collège royal des médecins et chirurgiens du Canada, ancienne présidente de la Société canadienne de pédiatrie, présidente du Comité d’éthique et membre du conseil d’administration de la Société canadienne de soins intensifs. Elle a reçu un remboursement de frais de déplacement de la Société canadienne de pédiatrie et du Collège royal des médecins et chirurgiens du Canada. Elle a aussi reçu des honoraires pour une présentation lors d’un symposium de formation continue à l’Université de Sherbrooke. Sarah Forgie est présidente de l’Association pour la microbiologie médicale et l’infectiologie Canada. Fatima Kakkar a reçu des honoraires pour des présentations données à l’Association des pédiatres du Québec. Thuy Mai Luu est directrice du Réseau canadien de suivi néonatal. Charlotte Moore Hepburn est directrice de Santé mentale pour enfants Ontario et directrice des affaires médicales pour la Société canadienne de pédiatrie et le Programme canadien de surveillance pédiatrique. Shaun Morris a reçu des honoraires de GlaxoSmithKline pour des conférences. Il a été membre d’un comité consultatif ad hoc pour Pfizer Canada. Jesse Papenburg a reçu des honoraires de consultation d’AbbVie et des honoraires d’AbbVie et de Seegene, et il a bénéficié de fournitures pour des tests de dépistage de virus respiratoires remis par Seegene pour son établissement. Il a participé à des réunions de comités consultatifs ad hoc pour AbbVie et il est membre ayant droit de vote du Comité consultatif national de l’immunisation. Rupeena Purewal est consultante pour Verity Pharmaceuticals. Manish Sadarangani est membre du comité consultatif d’Astra Zeneca. Marina Salvadori est une employée de l’Agence de la santé publique du Canada. Aucun autre intérêt concurrent déclaré.

Competing Interests: Intérêts concurrents: Anne Pham-Huy déclare avoir reçu des honoraires de la Société canadienne d’allergie et d’immunologie clinique et de l’Université de Calgary pour des présentations. Elle est présidente d’Immunisation Canada. Karina Top est co-investigatrice pour des projets subventionnés par GSK, indépendamment des travaux soumis. Elle déclare également avoir reçu des honoraires de la Société canadienne d’allergie et d’immunologie clinique, une rémunération du ministère de la Procureure générale de l’Ontario pour avoir témoigné en tant qu’experte et des honoraires à titre de conférencière de l’Association canadienne de la santé publique, indépendamment des travaux soumis. Elle est directrice du Conseil de l’AMMI Canada et membre de l’Association canadienne pour la recherche, l’évaluation et l’éducation en immunisation. Cora Constantinescu déclare avoir reçu des honoraires à titre de conférencière de GSK et Pfizer. Cynthia Seow fait partie de comités consultatifs et déclare avoir reçu des honoraires à titre de conférencière de Janssen, Abbvie, Takeda, Ferring, Shire, Pfizer, Sandoz, Pharmascience. Aucun autre intérêt concurrent n’a été déclaré.

Background: Risk factors for severe outcomes of SARS-CoV-2 infection are not well established in children. We sought to describe pediatric hospital admissions associated with SARS-CoV-2 infection in Canada and identify risk factors for more severe disease., Methods: We conducted a national prospective study using the infrastructure of the Canadian Paediatric Surveillance Program (CPSP). Cases involving children who were admitted to hospital with microbiologically confirmed SARS-CoV-2 infection were reported from Apr. 8 to Dec. 31 2020, through weekly online questionnaires distributed to the CPSP network of more than 2800 pediatricians. We categorized hospital admissions as related to COVID-19, incidental, or for social or infection control reasons and determined risk factors for disease severity in hospital., Results: Among 264 hospital admissions involving children with SARS-CoV-2 infection during the 9-month study period, 150 (56.8%) admissions were related to COVID-19 and 100 (37.9%) were incidental infections (admissions for other reasons and found to be positive for SARS-CoV-2 on screening). Infants (37.3%) and adolescents (29.6%) represented most cases. Among hospital admissions related to COVID-19, 52 (34.7%) had critical disease, 42 (28.0%) of whom required any form of respiratory or hemodynamic support, and 59 (39.3%) had at least 1 underlying comorbidity. Children with obesity, chronic neurologic conditions or chronic lung disease other than asthma were more likely to have severe or critical COVID-19., Interpretation: Among children who were admitted to hospital with SARS-CoV-2 infection in Canada during the early COVID-19 pandemic period, incidental SARS-CoV-2 infection was common. In children admitted with acute COVID-19, obesity and neurologic and respiratory comorbidities were associated with more severe disease., Competing Interests: Competing interests: Krista Baerg reports funding from the Chronic Pain Network. She also served as Past President of the Community Paediatrics Section of the Canadian Paediatric Society and on the Board of Directors for Saskatchewan Pain Society, and has received royalties from Brush Education. Kevin Chan is Chair of the Acute Care Committee of the Canadian Paediatric Society. Elizabeth Donner is Chair of the Scientific Research Committee and a director of Epilepsy Canada. She is also a member of Partners Against Mortality in Epilepsy and the advisory boards of Cardiol, Pendopharm and Stoke Therapeutics. Catherine Farrell is Chair of the Scientific Steering Committee for the Canadian Paediatric Surveillance Program, former Chair of the Specialty Committee in Pediatrics of the Royal College of Physicians and Surgeons of Canada, former President of the Canadian Paediatric Society, and Chair of the Ethics Committee and a member of the Board of Directors of the Canadian Critical Care Society. She has received reimbursement for travel expenses from Canadian Paediatric Society and the Royal College of Physicians and Surgeons of Canada. She has also received an honorarium for a presentation at a continuing education conference from the Université de Sherbrooke. Sarah Forgie is the President of the Association of Medical Microbiology and Infectious Disease Canada. Fatima Kakkar has received honoraria for presentations given to the Association des Pédiatres du Québec. Thuy Mai Luu is the Director of the Canadian Neonatal Follow-Up Network. Charlotte Moore Hepburn is the Director of Children’s Mental Health of Ontario, and the Director of medical affairs for the Canadian Paediatric Society and the Canadian Paediatric Surveillance Program. Shaun Morris has received honouraria for lectures from GlaxoSmithKline. He was a member of an ad hoc advisory board for Pfizer Canada. Jesse Papenburg has received consultant fees from AbbVie, honouraria from AbbVie and Seegene, and he received respiratory virus testing materials from Seegene for his institution. He has participated in ad hoc advisory board meetings for AbbVie and is a voting member of the National Advisory Committee on Immunization. Rupeena Purewal is a consultant for Verity Pharmaceuticals. Manish Sadarangani is a member of the advisory board of Astra Zeneca. Marina Salvadori is an employee of the Public Health Agency of Canada. No other competing interests were declared., (© 2021 CMA Joule Inc. or its licensors.)

Competing Interests: Competing interests: Anne Pham-Huy reports presentation honoraria from the Canadian Society of Allergy and Clinical Immunology and the University of Calgary. She is the chair of Immunize Canada. Karina Top is a co-investigator on grants from GSK, outside the submitted work. She also reports an honorarium from the Canadian Society of Allergy and Clinical Immunology, payment for expert testimony from the Ontario Ministry of the Attorney General and conference support from the Canadian Public Health Association, outside the submitted work. She is the director of the AMMI Canada Council and a member of the Canadian Association for Immunization Research Evaluation and Education. Cora Constantinescu reports speaker fees from GSK and Pfizer. Cynthia Seow sits on the advisory boards for and reports speaker fees from Janssen, Abbvie, Takeda, Ferring, Shire, Pfizer, Sandoz, Pharmascience. No other competing interests were declared.