influenza vaccine and covid-19 pandemic: could this vaccine help limit the potential adverse consequences of sars-cov-2?

The covid-19 pandemic has prompted researchers to find treatments and vaccines to control sars-cov-2. there are some hypotheses about the benefit of respiratory virus vaccines, like mmr, for covid-19 pneumonia severity, morbidity, and mortality. the influenza vaccine is one of the most frequently used respiratory virus vaccines covered by one of the iranian insurance institutes. we have a symmetrical group of participants that have received this vaccine that could be compared with each other. we compared 3,379 persons aged 20 - 75 years for the effect of the influenza vaccine on covid-19 mortality. we ultimately found that it does not affect mortality caused by covid-19 pneumonia, but it can decrease the hospitalization cost in people over 65 years with a history of chronic disease.