COVID-19 vaccination and long COVID-19

According to the literature, COVID-19 vaccines reduce long COVID-19 symptoms such as cognitive dysfunction, kidney diseases, myalgia, and sleeping disorders (5-7). Therefore, the results of the meta-analysis support the clinical safety and efficacy of SARS-CoV-2 vaccines against long COVID-19. However, the available studies have several limitations: 1) there were individuals that exhibited natural improvement of long COVID-19 symptoms which may have been underestimated as vaccination in clinical setting; 2) studies used wide range of COVID-19 vaccines including both inactivated vaccines and mRNA COVID-19 vaccines. Thus, findings should be interpreted with caution. Since booster vaccines show great promise in both prevention of infection and progression, further research on boosters and omicron-specific vaccination is needed to be performed. Consequently, the current comprehensive literature recommends SARS-CoV-2 vaccine to reduce the risk of long COVID-19 in cases of progression. There are no findings of a negative effect of COVID-19 vaccination on worsening symptoms of COVID-19. Therefore, SARS-CoV-2 vaccination should be improved as soon as possible, especially offering a full course of vaccination. More research is needed to discover the mechanism of action of the COVID-19 vaccines on long COVID-19 in the future.