As such, they provide a high degree of immunity, but won’t guarantee protection from all cases.
Eradication requires countries to reduce the presence of a given disease to zero.
Experts believe the virus’s infectivity will produce barriers for eradication, as it can still travel between countries with ease.
Walter Orenstein, associate director of the Emory Vaccine Centre in Atlanta, US, said he would be “shocked” if the world eradicated Covid-19.