[set fair (OP)]

... covid outcomes?
A retrospective study would do. Would need to get their skates on,

[Bored chemist]

There will be a strong correlation between having had a flu shot last year and dying of covid (among those who caught it).

There will also be a strong correlation with being able to remember the second world war.
It will also correlate with owning an inhaler.

Not sure what use this data is, but you are welcome.

[set fair (OP)]

Poor old Bored Chemist.

[Bored chemist]

Poor old Bored Chemist.

Wong on both counts.

Just out of idle curiosity, what question did you think you had asked?

[set fair (OP)]

Age differences are easy to deal with, the trickier confounding variables are the reasons people choose to have or not have the jab. But a pilot study would tel us if there is a need to look further. Any health system which has a proper data base could carry out a pilot study very quickly... as anyone who listens to TMS will know.

[Bored chemist]

Age differences are easy to deal with, the trickier confounding variables are the reasons people choose to have or not have the jab. But a pilot study would tel us if there is a need to look further. Any health system which has a proper data base could carry out a pilot study very quickly... as anyone who listens to TMS will know.

Tetramethylsilane?
Test Match Special?

There's no particular reason to think that a flu jab would make a difference.
So, don't you agree that  it would make sense to spend the time and money looking at other things first?

[set fair (OP)]

There was a study in 2012 which found an incrased number of respiratory diseases in children who had the flu shot https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3404712/ subsequent studies failed to find a correlation. A more recent study found

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.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7126676/