It is unlikely that we will reach full herd immunity for Covid-19. However, we are likely to reach a practical kind of herd immunity through vaccination
The priority of priorities of all countries is to vaccinate their population to protect people against the risk of Covid-19 infection and reach the required herd immunity protection
If supplies of COVID-19 vaccine are initially limited, who should be vaccinated first? A mathematical model shows when and why it’s best to start with the young,