I still remember the VEE (Venezuelan equine encephalitis ) back in 1962-1964. Lots of people also got it and according to news sources back then it caused a change in personality in the survivors.
It’s remarkable how many ways there are to croak out.
https://search.brave.com/search?q=Venezuelan+equine+encephalitis
Gina Kolata in her book “Flu” notes that the 1890s killer flu was apparently similar to the 1918 “Spanish Lady” in that, anyone who’d survived the earlier outbreak didn’t even get the sniffles during the 1916-1920 version.
Years ago I asked some old relatives about it, one of them asked what I meant, and when reminded, said, “oh yeah, that was a bad one.” And that’s it. “that was a bad one.” Heh...
https://www.aspentimes.com/news/a-19th-century-influenza-presages-the-20th-century-pandemic/