For the last few weeks, one medical term has unexpectedly become the internet's favorite punchline: "explosive diarrhea parasite."

As news outlets continue reporting on the growing Cyclospora outbreak across the United States, numerous social media users have quickly turned the alarming symptom into a wave of jokes and memes about Taco Bell, "diarrhea forever" and "diarrhea lettuce."

Known as the "Cyclospora Outbreak" or "Explosive Diarrhea Parasite," the trend revolves around turning the headlines describing the foodborne parasite and its most infamous symptom into a wide array of memes, just like the internet always does with a major pandemic or epidemic (anyone remember the Hantavirus?).

But what exactly caused the outbreak, and why did it become such a widespread source of internet humor? Why is everyone seemingly afraid of fresh produce now? Let's explain.

Where Does The 'Cyclospora Outbreak' Meme Come From?

The meme originated from reports of an outbreak of Cyclospora cayetanensis, a foodborne parasite that spread across the U.S. (and later Canada) in late June and July 2026.

One of the earliest viral posts appeared on June 30th, 2026, when the X / Twitter account of Polymarket shared a headline stating that a parasite causing explosive diarrhea had reportedly spread to 20 U.S. states.

The phrasing of the post, particularly its emphasis on "explosive diarrhea," quickly drew widespread attention and inspired an immediate wave of jokes online.

As health officials continued investigating the outbreak, news organizations reported that the parasite was likely spreading through contaminated fresh produce, such as lettuce.

By early July, more than 100 cases had been identified across numerous states, while restaurants, including Taco Bell, temporarily removed ingredients such as lettuce, guacamole and pico de gallo from many locations as a precaution.

Later reports suggested lettuce as a likely source of the outbreak and warned that additional cases could continue through the summer.

How Is The 'Explosive Diarrhea Parasite' Used In Memes?

Most memes about the Cyclospora outbreak focus less on the parasite itself and more on the repeated use of the phrase "explosive diarrhea" in news headlines.

Over the last few weeks, users have created all sorts of memes and jokes imagining endless bathroom trips or exaggerating the severity of the symptom for comedic effect.

Another early viral example appeared on June 30th, 2026, when an X user replied to the initial outbreak report with a Rodney Dangerfield meme joking, "Yeah, it's called my wife's cookin'."

Many SpongeBob SquarePants memes about the outbreak have also been spread widely on Reddit since the news garnered mainstream attention.

As reports linked the outbreak to produce and Taco Bell removed several fresh ingredients from its menu, many jokes shifted toward the fast-food chain's longstanding reputation for allegedly causing stomach problems.

Some Redditors joked that "diarrhea has always been built into the experience," while others compared removing the contaminated ingredients to Disney removing Mickey Mouse.

Additional memes referencing lettuce as the suspected source continued circulating throughout July, cementing the Cyclospora outbreak as one of the internet's more humorous viral news stories of 2026.

What Are Some Examples Of 'Cyclospora' And 'Diarrhea Forever' Memes?

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For the full history of the Cyclospora Outbreak memes, be sure to check out Know Your Meme's encyclopedia entry for even more information.