[bsder]

I have never heard of such a thing in the US. Someone else will have to chime in about European countries.

[abunuwas]

I live in Europe and never experienced such a thing. Perhaps to be more specific: I grew up in Spain and now live in the UK. To the best of my knowledge, children keep catching the flu every year and passing it on to their parents, who instead pass it on to their colleagues in the office (or used to, before 2020).

[oblio]

Romania, Luxembourg - no flu vaccinations from what I see.