Scientists from the University of Oxford and the Chinese Academy of Medical Sciences (CAMS) have discovered a “kill switch” in human cells that is left behind after a COVID-19 virus infection. The team of researchers published a bombshell new study showing that spike-specific helper T cells remain in the body years after COVID-19 infection. Alarmingly, those cells undergo a troubling transformation over time. The research, led by Dr. Guihai Liu and Professor Tao Dong, followed patients 3–4 years after infection. The study revealed that these CD4+ T cells not only persisted but also morphed into a more aggressive, cytotoxic form....