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Objective: To assess the burden of respiratory syncytial virus (RSV)-related bronchiolitis in primary care and at 15 days and 6 months after a primary care visit., Study Design: In this test-negative study, children <2 years old with a first episode of bronchiolitis were prospectively enrolled by 45 ambulatory pediatricians in France from February 2021 to April 2023. RSV was assessed with a rapid antigen detection test. The burden of the disease was assessed with a questionnaire, including quality of life (PedsQL 1.0 Infant Scales), at 15-day and 6-month follow-up. Children with a positive RSV test result (RSV+) were compared to those with a negative test result (RSV-)., Results: Among the 1591 children enrolled, 750 (47.1%) were RSV+. At 15 days follow-up (data availability: 69%), as compared with RSV- children, RSV+ children more frequently had fever (20.5% vs. 13.7%, P = 0.004) and decreased food intake (27.0% vs. 17.4%, P < 0.001) during the last 3 days. They had higher rates of hospitalization (11.8% vs. 5.8%, P < 0.001), childcare absenteeism (83.5% vs. 66.1%, P < 0.001) and parents who had to stop working to care for them (59.1% vs. 41.0%, P < 0.001) as well as lower quality of life (median PedsQL score 76.2 vs. 78.4, P = 0.03). At 6 months (data availability: 48.5%), the 2 groups did not differ in proportion of medical attendance, hospitalization, antibiotic treatment or quality of life., Conclusion: RSV+ children experienced much more severe disease and follow-up family and societal burden than RSV- children. These data may be used as baseline data as RSV prophylaxis is about to be implemented., Competing Interests: A.R. received personal fees from MSD and Sanofi and nonfinancial support from Pfizer and AstraZeneca outside the submitted work. R.C. received personal fees and nonfinancial support from Pfizer and personal fees from Merck, GSK, Sanofi and AstraZeneca outside the submitted work. M.B. and R.K. are employed at Sanofi. C.L. received personal fees and nonfinancial support from Pfizer and Merck outside the submitted work. The other authors have no conflicts of interest to disclose., (Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc.)

We report early results from a prospective primary care bronchiolitis surveillance study in France in which a 10-week delayed epidemic was detected from February to March 2021. Among 225 children under 2 years with swab testing for a first bronchiolitis episode, 55% had a positive test for RSV, 0 for influenza, and 1 for severe acute respiratory syndrome coronavirus 2., Competing Interests: C.L. received personal fees and nonfinancial support from Pfizer and Merck outside the submitted work. F.C.-S. reported personal fee and nonfinancial support from MSD Vaccines and Sanofi outside the submitted work. M.B. is employed by Sanofi Pasteur France. R.C. received personal fees and nonfinancial support from Pfizer; reported personal fees from Merck, GSK, Sanofi and AstraZeneca outside the submitted work. The other authors have no conflicts of interest to disclose., (Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.)