Six months into the COVID-19 pandemic, we’re still learning what the disease can do. There are now detailed reports of brain illness emerging in people with relatively mild lung illness, in those who are critically ill and also in those in recovery. One key thing we’re seeing is that severity of lung illness doesn’t always correlate with severity of neurological illness. Having only minor lung illness doesn’t protect against potentially severe complications. When it comes to the brain and nerves, the virus appears to have four main sets of effects: A confused state (known as delirium or encephalopathy), sometimes with…

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