CV made worse by flu jab

https://pubmed.ncbi.nlm.nih.gov/31607599/
If you have a flu shot .. You are more susceptible to the corona virus ..
. Examining virus interference by specific respiratory viruses showed mixed results. Vaccine derived virus interference was significantly associated with coronavirus and human metapneumovirus; however, significant protection with vaccination was associated not only with most influenza viruses, but also parainfluenza, RSV, and non-influenza virus coinfections.