RT Journal Article SR Electronic T1 Prevalence of SARS-CoV-2 positivity in infants with bronchiolitis: a multicentre international study JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 840 OP 844 DO 10.1136/archdischild-2021-323559 VO 107 IS 9 A1 Giorgio Cozzi A1 Luisa Cortellazzo Wiel A1 Alessandro Amaddeo A1 Antonio Gatto A1 Manuela Giangreco A1 Adi Klein-Kremer A1 Samantha Bosis A1 Davide Silvagni A1 Carla Debbia A1 Laura Nanni A1 Sara Chiappa A1 Marta Minute A1 Ilaria Corsini A1 Giuliana Morabito A1 Anna Jolanda Gortan A1 Marco Colombo A1 Federico Marchetti A1 Davide Garelli A1 Arianna Piffer A1 Fabio Cardinale A1 Nitai Levy A1 Antonietta Curatola A1 Bojana Gojsina A1 Suvradeep Basu A1 Egidio Barbi A1 Aleksandar Sovtic A1 , YR 2022 UL http://adc.bmj.com/content/107/9/840.abstract AB Background Bronchiolitis is the leading acute respiratory tract infection in infants during the winter season. Since the beginning of the SARS-CoV-2 pandemic, a reduction in the number of bronchiolitis diagnoses has been registered.Objective The present study aimed to describe the incidence and clinical features of bronchiolitis during the 2020–2021 winter season in a large cohort of children in Europe and Israel, and to clarify the role of SARS-CoV-2.Setting, patients, interventions We conducted a multicentre observational cross-sectional study in 23 paediatric emergency departments in Europe and Israel. Clinical and demographic data about all the cases of infants diagnosed with bronchiolitis from 1 October 2020 to 30 April 2021 were collected. For each enrolled patient, diagnostic tests, treatments and outcomes were reported.Main outcome measures The main outcome was the prevalence of SARS-CoV-2-positive bronchiolitis.Results Three hundred and fourteen infants received a diagnosis of bronchiolitis during the study period. Among 535 infants who tested positive for SARS-CoV-2, 16 (3%) had bronchiolitis. Median age, male sex predominance, weight, history of prematurity and presence of comorbidities did not differ between the SARS-CoV-2-positive and SARS-CoV-2-negative groups. Rhinovirus was the most common involved pathogen, while respiratory syncytial virus (RSV) was detected in one case. SARS-CoV-2 bronchiolitis had a mild clinical course, with one patient receiving oxygen supplementation and none requiring paediatric or neonatal intensive care unit admission.Conclusions During the SARS-CoV-2 pandemic, a marked decrease in the number of bronchiolitis diagnoses and the disappearance of the RSV winter epidemic were observed. SARS-CoV-2-related bronchiolitis was rare and mostly displayed a mild clinical course.Data are available on reasonable request.