Compared with those vaccinated with influenza vaccine, the risk of receiving ICU treatment increased by 20% and emergency treatment increased by 58%. The risk of sepsis, stroke and deep venous thrombosis were 45%, 58% and 40%, respectively.
Previous studies have said that there is a link between the nucleic acid test results of the new crown and whether to be vaccinated with influenza vaccine. People vaccinated with influenza have a lower risk of detecting the positive of the new crown, which is consistent with this result.
However, novel coronavirus pneumonia was not found in the vaccine. The previous study also found no protective effect of influenza vaccine on the infection of new crown.
The researchers added that novel coronavirus pneumonia is associated with a lower risk of new crown pneumonia, and does not mean that it can prevent COVID-19. Novel coronavirus pneumonia may increase immunity but influenza vaccination is generally more healthy than those who are not vaccinated. Their risk of new crown pneumonia is lower.
In addition, influenza vaccine will change in different influenza seasons. The influenza vaccine developed from 2019 to 2020 is different from that developed in the 2020 - 2021 influenza season, so whether the latter will have the preventive effect on COVID-19 is not clear.
Another limitation is that the electronic medical record entry standards are different. Different countries may report different symptoms and use different diagnostic tests to diagnose COVID-19 infection, which may cause data deviation. Although more research is needed, considering that the new crown vaccine can not guarantee complete immune effect, people who have been fully vaccinated may also benefit from influenza vaccination.
