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Impact of COVID-19 vaccination on the risk of developing long-covid and on existing long-covid symptom Investigate impact of COVID-19 vaccination on long-COVID symptoms COVID-19 vaccination reduces the risk of severe illness, but it is unclear if the vaccine administered may impact its prevalence. A systematic review is used to investigate this association. Symptoms after the acute phase of SARS-Cov-2, usually after three months, cause the condition called long-COVID or post-COVID. One hundred symptoms or more can appear after a SARS-Cov-2 acute infection affects systems like cardiovascular, respiratory, musculoskeletal, or neurological. Servers such as MEDLINE, CINAHL, PubMed, Science databases, medRxiv, and bioRxiv were searched up to June 20, 2022. Preprints and studies monitoring multiple symptoms that appeared after SARS-CoV-2 infection before or after COVID-19 vaccination. Information was collected by conducting interviews in person, electronically, or by telephone. 2548 studies were identified, 11 peer-reviewed studies, and six preprints were included. The methodological quality was high at 82%. Overall, the vaccine proved effective in reducing the risk of long-COVID and two doses were better than one. I want make some kind comments for this sentences