A new study has found evidence of a “robust cellular memory” against Covid-19 that lasts for at least six months after infection, reinvigorating the question of whether natural infection with the virus could grant lasting immunity after a study last week showed a rapid decline in protective antibodies in the months after infection. Understanding how the immune system responds to Covid-19 over time is a vital component in controlling the pandemic, underpinning public health measures, treatments, and how vaccines are developed and administered. A lot of early attention has focused on antibodies, proteins produced by the immune system that can lock onto the virus. These are relatively easy to study, but do not give a complete picture of the body’s immune system. Cellular studies, such as this one looking at T-cell responses, are much more onerous to conduct, but give a much more complete understanding of how the body is responding to Covid-19 and whether any protection can endure. Just because there is an immune response, does not mean there is immunity from infection. Further studies will be needed to understand the long-term impact of Covid-19 infection. Covid Patients Show Key Immunity Gauge After Six Months in Study (Bloomberg)Cellular immunity to SARS-CoV-2 found at six months in non-hospitalised individualsStudy: Covid-19 Immunity May Wear Off After Infection (Forbes)Man, 25, Is The First In The U. S. To Catch Covid-19 Twice, Second Time Worse Than The First (Forbes)Can You Get Covid-19 Coronavirus Twice? Here Is An Update On Immunity (Forbes)Can You Get Covid-19 Twice? An Infectious Disease Doctor Explores The Possibility (Forbes)Why We Can’t Rely On Natural Immunity To Protect Us From Covid-19 (Forbes)Fauci Attacks Herd Immunity Declaration Embraced By White House As ‘Total Nonsense’ (Forbes)Full coverage and live updates on the Coronavirus
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