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How much does London Covid affect our brain? In essence, is it possible to measure its impact in quantitative terms? The question posed by many experts who have been struggling for three years with the cognitive fog caused by the SARS-CoV-2 virus on patients with an infection that lasts months, or years, has now found a concrete answer. Yes, it is possible to measure the damage that the Covid infection produces on our cognitive activities: the virus can “burn” 6 IQ points (IQ), and in patients hospitalized in intensive care, even 9.