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jeff burton, thank you very much foryourtime.. scientists have found that patients who suffer the most severe form of the coronavirus, also have extremely low levels of t—cells — a type of white blood cell which helps the immune system fight off the virus. a clinical trial for a drug that is known to boost t—cell production is underway, which could offer treatment for those who become critically ill. our sceince correspondent, victoria gill, reports. for an unlucky minority of patients, covid—19 is a cruel disease, and it's one with no specific treatment. but an examination of blood samples taken from 60 hospital patients has now revealed a vital clue — the samples show that those with the most severe form of the disease also had extremely low numbers of a particular virus—fighting immune cell called a t cell. it is a ver specific type of t cell, the one that we need to remove these virus—infected cells that appears to be getting into so much trouble. so that tells us a lot about how we try to fight the virus but it also offers w