PICO Question: In patients aged 65 and older (P), how does the use of the Covid-19 vaccine (I) compared to not receiving the vaccine (C) influence the risk of developing adverse reaction (O) within the first week of administration?
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PICO Question: In patients aged 65 and older (P), how does the use of the Covid-19 vaccine (I) compared to not receiving the vaccine (C) influence the risk of developing adverse reaction (O) within the first week of administration?