Analysis of Beyfortus^® (Nirsevimab) Immunization Campaign: Effectiveness, Biases, and ADE Risks in RSV Prevention.

There is a highly significant peak ( p = 0.006) for babies born in September 2023 and dying between 2 and 6 days, with 55 deaths (95% CI 27–50).

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In December 2023, the number of deaths is high, at the limit of significance at 2.5%, with 50 deaths (95% CI 26–50).

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