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Infectious Information: Parasites Spreading [1]

['The Swamp Wytch']

Date: 2026-07-15  

At last count the cyclosporiasis outbreak has spread to 40 states (this number keeps going up every few days) and thousands of people. The case count is almost certainly an undercount:

A. because people don’t always get to a doctor and get tested, unless it’s really serious.

B. because DOGE slashed the funding for food-borne disease surveillance. So the CDC is flying blind, relying on state labs, and can do little to locate the source and lock it down. Illness from Shigella, Listeria, Cyclospora, campylobacter, vibrio, and Yersinia are no longer required to be reported.

Cyclospora cayatanensis is a microscopic parasite. Not a bacteria, virus, or fungus, it is a protozoan, a single-celled organism, and it produces oocysts.

It has spherical oocysts that are 7.5–10 μm in diameter that also have a 50-nm-thick wall with an outer thread-like coat that has been called a wrinkle by some researchers. The oocyst formula is O.2.2 because one oocyst contains two sporocysts and each sporocyst contains two sporozoites.[3] (wikipedia)

It is a human obligate parasite. Animals cannot catch it nor spread it, there is no natural reservoir but humans, no insect vector, nothing. The only way it spreads is for human fecal matter to get on human food or in drinking water. Yeah, that. Cooking kills it, very little else does. So raw foods are the danger, and contaminated water. Once in a human digestive system, the oocysts break open and release the sporozoites which invade the intestinal lining. It incubates for about a week. So it is harder to recall and associate which foods the patient might have eaten that could have been contaminated, unlike most food-borne illness, which strikes within hours. Once the parasite matures, it reproduces and the oocysts are shed in the feces.

Since oocysts are shed in the feces of infected persons and then must mature in the environment for 2–14 days before they can become infectious, it is unlikely for a person to get an infection directly from another person, such as an infected food handler.[1] (wikipedia)

Contaminated water used on crops is a common method of spread. Chlorine or iodine treatment of water does not reliably kill all the oocysts. One-micron carbon filtering will remove most or all. Reducing the presence will probably reduce severity of illness or allow persons to shake it off.

The illness can last from a few days up to six weeks in some cases, and can vary from mild or unnoticeable to severe, requiring hospitalization due to dehydration. It can relapse too. It is very rarely fatal.

Treatment is typically with Bactrim (trimethoprim/sulfamethoxazole (TMP-SMX)), most anti-protozoan drugs don’t work. Other drugs are less effective, but may be used for those who cannot take Bactrim.

It is extremely difficult to remove ALL the oocysts by washing, no matter what you put in the wash water. The most delicate foods that would be ruined by forceful scrubbing can carry it.

Forty states. We’re not talking about a few restaurant workers not washing their hands here. We’re looking for a food processor. One of the big players that ships all over, wholesale. Somebody either has a contaminated processing line or is sourcing from contaminated farms. It could be imported produce from tropical or subtropical countries, where the parasite is endemic. Or the systems using sewage sludge for fertilizer or reclaimed water for irrigation right here in the US might be failing to sterilize before use.

If you experience symptoms, chiefly watery diarrhea, nausea, cramping and fatigue, go get tested and treated. And try to make up a food diary that might help track down the culprit.

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[1] Url: https://www.dailykos.com/stories/2026/7/15/800069342/community/par/

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