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The scientists studied a cohort of 129 healthcare workers at high risk of an infection for 16 weeks and found that 57 never tested positive for the virus. When they looked to see what their immune systems were doing, they discovered they had mounted a robust T-cell response to Covid-19, suggesting they had encountered the virus but managed to shake it off. Crucially, the T-cells had ramped up targeted areas of the genetic code shared by both colds and Covid-19. The T-cells were so effective in clearing out the infection that the healthcare workers never developed antibodies to the disease. Francois Balloux, professor of computational systems biology at UCL, said: The evidence points to protection originating from prior exposure to endemic common cold coronaviruses [HCoVs]. Latent infection to low levels of SARS-CoV-2 might also have played a role.

Francois ballouxAjit lalvaniPublic health englandImperial collegeScience museumResearchers at university college londonUniversity college londonCovid fightingt cellsஅஜித் லால்வானிபொது ஆரோக்கியம் இங்கிலாந்துஏகாதிபத்தியம் கல்லூரிஅறிவியல் அருங்காட்சியகம்ஆராய்ச்சியாளர்கள் இல் பல்கலைக்கழகம் கல்லூரி லண்டன்பல்கலைக்கழகம் கல்லூரி லண்டன்