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Monitoring the Status of Multi-Wave Omicron Variant Outbreaks - 71 Countries, 2021-2023.
Chuanqing Xu1, Lianjiao Dai1, Songbai Guo1
1School of Science, Beijing University of Civil Engineering and Architecture, Beijing, China.
China CDC Weekly
|November 6, 2024
Summary
Income inequality impacts coronavirus disease 2019 (COVID-19) case-fatality ratios during severe acute respiratory syndrome virus 2 Omicron variant epidemics. Higher income countries experienced lower fatality rates in early epidemic stages.
Area of Science:
- Epidemiology
- Infectious Disease Dynamics
- Public Health
Background:
- The emergence of severe acute respiratory syndrome virus 2 (SARS-CoV-2) Omicron variants and their subvariants has altered the landscape of the coronavirus disease 2019 (COVID-19) pandemic.
- Understanding the characteristics of epidemic waves and the influence of socioeconomic factors like income inequality is crucial for managing novel coronavirus infections.
Purpose of the Study:
- To analyze the epidemic development patterns of SARS-CoV-2 Omicron subvariants.
- To investigate the impact of income level inequalities on the COVID-19 case-fatality ratio (CFR) during Omicron variant epidemics.
Main Methods:
- Statistical analysis of epidemic wave intervals for Omicron subvariants.
- Comparative analysis of COVID-19 CFR across different income-level countries during initial epidemic phases.
Main Results:
- The median interval between Omicron subvariant waves followed a lognormal distribution (70 days between first and second, 87.5 days between second and third).
- The first wave exhibited a significantly higher CFR compared to subsequent waves.
- Early in the epidemic, countries with higher income levels demonstrated a significantly lower CFR than those with lower income levels.
Conclusions:
- Income inequalities significantly influence COVID-19 CFR during the early stages of Omicron epidemics.
- Public health strategies must consider socioeconomic disparities to mitigate pandemic impact.
- SARS-CoV-2 strains typically transition from low to high population prevalence within 2-4 months in most countries.
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