Jan 02 2021 Read 353 Times An unexpected discovery has led scientists from Cardiff University, St George’s, University of London, Imperial College London and the USA, to believe that a key type of immune cell previously thought to die when end stage has been reached “self-renews” in humans. “Since the COVID-19 pandemic, T-cells – the immune cells that have a crucial role in killing infected cells and protecting us against infection – have been in the spotlight and it is crucial we continue to learn more about the role they play in long-term immunity, for good or for bad,” said lead author Dr Kristin Ladell, from Cardiff University’s School of Medicine.