Originally Posted by
Pistonprop
But don't forget that vaccines are not 100% effective for everyone. Before Covid there were still many "normal" flu deaths of which a fair percentage included people who had had their annual flu jab.
A future COVID19 vaccine with the same efficiency as the normal flu vaccine only requires about 40% of the population to be vaccinated to give sufficient reliable protection against a pandemic influenza. This requires people in high risk groups to be monitored, take extra precautions, and confirmed cases to be quarantined much as we are doing now in most parts of the world. If no extra measures like these are taken at least 80% of the population needs to be vaccinated to get the same protection.