@toocold54
"I think it took about 30 years to eradicate polio from when the vaccine was first introduced.
It doesn’t happen over night but I think we’ve done pretty well to manage covid, considering it is spread through non-direct contact in the air and so obviously much harder to control than other illnesses.
A major part of this is because so many people have had the vaccination.
If lots of people get a vaccination within a certain time frame then herd immunity kicks in and the disease can be eradicated, like polio is.
But if people stop having the polio vaccination then it can return.
Obviously if it mutates, then that is much harder to eradicate, especially if animals also carry "
++++
The polio virus and vaccination is a completely different virus class (Class: Pisoniviricetes) to Covid ((coronavirus of which there are 7 variants, four of which are in the form of common colds).
No matter how many people get the Covid jab you will never ever eradicate the Covid virus because the jab doesn't stop you getting covid or passing it on but reduces the severity of symptoms. So it keeps on circulating and mutating just like the cold virus does.
Conversely the polio vaccine in the majority of cases stops you getting polio so if you vaccinate enough people then you could in theory eradicate the virus as has happened with smallpox. Although not fully eradicated there were only 6 cases of polio in the world during 2021. Smallpox on the other hand has been completely eradicated and the virus only exists in labs removing the need for further vaccinations.
Think of the Covid jab like the flu jab which needs to be updated every year to deal with mutations in the flu virus.
You are correct in that the covid jab has helped in managing it but equally so has natural resistance acquired by so many people getting Covid.