Characteristics and factors of repeated influenza vaccination among elderly individuals in Shanghai, China from 2020 to 2022.

Over these three years, the influenza vaccination coverage for registered elderly individuals was 5.51%, 3.61%, and 3.20% respectively, indicating a decreasing trend ( p < .001), as shown in Table 1 .

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Conversely, individuals aged 65–79 and those aged 80 and above exhibited an increasing trend ( Table 1 ).

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