For other age groups, the daily number of confirmed cases increased significantly after 4 August, and the overall number also showed a trend of first increment and then decrement.
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Epidemiological Characteristics of COVID-19 Outbreak in Yangzhou, China, 2021.
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The sentences
The spread and pathogenicity of these mutant strains in the population showed an increasing trend ( Janik et al., 2021 ; Plante et al., 2021 ; Yi and Wenhong, 2021 ), leading to the continued spread of COVID-19 worldwide.