In fact, the screengrabs were doctored, and the episode in question involved a relatively benign case of the “Osaka flu.”
In the early days of the coronavirus pandemic, for example, social media was filled with screengrabs from an episode where The Simpsons supposedly called Covid.
If you’re curious about the entire episode, “Simpson Tide” is available for streaming on Disney+, along with the rest of The Simpsons.
The clip in question is from the Season 9 episode “Simpson Tide,” written by Joshua Sternin and Jeffrey Ventimilia, which originally aired on March 29, 1998, nearly 24 years ago.