It’s estimated that more than a third of people who have had COVID-19 experience neurological complications such as brain fog that persist or develop 3 months after infection. And two thirds of so-called long haulers still have neurological symptoms after 6 months.
Source: https://www.webmd.com/lung/news/20221018/long-covid-experts-so-incredibly-clear-whats-at-stake?src=RSS_PUBLIC