>ALL vaccines work by reducing R0 to <1 so outbreaks shrink rather than growing.

How does the flu vaccine work, except by providing some chance of protection to those taking it?

It reduces the severity of flu outbreaks for a population by reducing the likelihood and severity of infection for individuals.

Just like covid vaccines, flu vaccines also protect unvaccinated people by making it less likely for them to be exposed to the virus in the first place.

The critical thing that antivax people miss is that they are both individuals and members of a population. Reducing the odds of infection for individuals has an exponential effect on reducing the odds for a population.

>ALL vaccines work by reducing R0 to <1 so outbreaks shrink rather than growing.

I meant this statement. No-one has ever suggested that the flu vaccines will stop the overall flu outbreak from growing.

Reducing the odds of infection also strongly depends on the extent to which that vaccine provides sterilising immunity.