Rates of sudden unexpected infant death (SUID) and sudden infant death syndrome (SIDS) increased during the COVID-19 pandemic, with the most significant rise observed in 2021. A cross-sectional study using US mortality data from 2018 to 2021 showed an increased risk of SUID (IR 1.06) and SIDS (IR 1.10) during the pandemic. SUID rates rose beyond pre-pandemic levels from July 2020 onwards, while SIDS rates increased throughout the pandemic, peaking in July and August 2021. The study suggests a correlation between seasonal fluctuations in respiratory syncytial virus (RSV) hospitalizations and SUID rates. However, limitations in data collection and reporting may affect the study’s findings.
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