• Ir J Med Sci · Dec 2023

    Meta Analysis

    The risk of mortality and severe illness in patients infected with the omicron variant relative to delta variant of SARS-CoV-2: a systematic review and meta-analysis.

    • Chia Siang Kow, Dinesh Sangarran Ramachandram, and Syed Shahzad Hasan.
    • School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia. chiasiang_93@hotmail.com.
    • Ir J Med Sci. 2023 Dec 1; 192 (6): 289729042897-2904.

    AbstractWe summarized through systematic review and meta-analysis of observational studies the risk of mortality as well as severe illness of COVID-19 caused by omicron variant relative to delta variant of SARS-CoV-2. A total of twelve studies were included. Our results showed significantly reduced odds of mortality (pooled OR = 0.33; 95% CI: 0.16-0.67) and significantly reduced odds of severe illness (pooled OR = 0.24; 95% CI: 0.21-0.28) in patients infected with the omicron variant of SARS-CoV-2 relative to their counterparts infected with the delta variant. Findings of lower disease severity following infection with the omicron variant of SARS-CoV-2 than the delta variant are encouraging during the ongoing transition from the pandemic phase into the endemic phase of COVID-19.© 2023. The Author(s).

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