Mathematical modeling of SARS-CoV-2 variant substitutions in European countries: transmission dynamics and epidemiological insights.

The main findings can be summarized as follows: ( i ) the continuous evolution of the virus has resulted in an increasing trend in its transmissibility from the Alpha variant to Delta and subsequently to the various Omicron variants; ( i i ) later-emerging variants tend to spread more rapidly upon their entry into a population, which can be explained by a higher chance of multiple entries; ( i i i ) the spread pattern of CO

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For the Delta variant, our analysis presents an interesting trend.

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