There does seem to be some indication of brain effects in the flu. https://www.newsweek.com/does-flu-affect-your-mind-bad-memory-and-brain-changes-could-result-

There does seem to be some indication of brain effects in the flu. https://www.newsweek.com/does-flu-affect-your-mind-bad-memory-and-brain-changes-could-result-after-821097 https://www.newsweek.com/does-flu-affect-your-mind-bad-memor...