Several factors, including the portion of those at highest risk among the double-vaccinated and antibody levels, account for the data
The next wave of Covid will be different. When cases soared in spring and winter last year lockdowns rapidly brought them back under control. This time it will be vaccines that do the hard work.
But Covid jabs are not a perfect shield. They slow the spread of the virus, help prevent disease, and reduce the risk of dying. They do not bring all this to an end.
