The Imperial College London team found the number of people testing positive for antibodies has fallen by 26% between June and September. They say immunity app

The Imperial College London team found the number of people testing positive for antibodies has fallen by 26% between June and September. They say immunity appears to be fading and there is a risk of catching the virus multiple times. ... The researchers say their findings do not scupper hopes of a vaccine, which may prove more effective than a real infection.