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?

   Covid-19 Vaccine and the Risk Involved in the Vaccine  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?IntroductionThe research proposal should:1 page