Originally Posted by TellyKNeasuss
When pathogens have a worldwide
reservoir of humans (not even looking at if any animal reservoirs exist), you're not going to wipe it out unless you can track down and eliminate the spread everywhere in the world.
We're trying very hard to do that with polio which we know only has a human reservoir and we've yet to achieve success.
With good vaccine coverage in the US, Canada, the UK and the EU we might be able to eliminate it in those countries but we'd still have to monitor for cases introduced and do extensive contact tracing should that occur.
From experience with other highly contagious pathogens we probably need about 90-95% vaccine coverage (provided the vaccine is highly effective). Anti-vaxxers are preventing that level of coverage for measles allowing cases to be introduced and spread on a regular basis.