The United States has officially declared an end to its largest recorded outbreak of cyclospora, an intestinal parasite that caused illness in nearly 20,000 people across the country. The Centers for Disease Control and Prevention (CDC) announced on Friday that cases had “significantly declined” and the outbreak was over, after affecting 49 states and the District of Columbia, as reported by the BBC and Al Jazeera.
The outbreak led to more than 1,000 hospitalisations and was linked to two deaths, both occurring in Michigan. These individuals had significant underlying health conditions that may have been exacerbated by the infection and dehydration, according to health officials in Michigan.
What is Cyclospora?
Cyclospora is a microscopic parasite that, when ingested through contaminated food or water, causes an intestinal illness known as cyclosporiasis. Symptoms typically include frequent, watery diarrhoea, often described as “explosive”, along with loss of appetite, weight loss, stomach cramps, bloating, gas, nausea, and extreme tiredness. Symptoms can appear anywhere from two days to two weeks after exposure, though usually about a week. The CDC notes that deaths from cyclosporiasis are uncommon as it is “not usually life-threatening”.
Outbreak Source and Impact
Federal investigators linked the widespread outbreak to contaminated iceberg lettuce imported from central Mexico, supplied by Taylor Farms de Mexico. Taylor Farms announced a voluntary recall of its lettuce sourced from the region on July 17. The US fast-food chain Taco Bell also removed lettuce from this supplier from its menu, experiencing a “meaningful” short-term impact on sales, though these have been “steadily improving,” according to The Guardian. The FDA “remains confident that all recalled iceberg lettuce related to this specific Cyclospora outbreak is off the market.”
The scale of the outbreak was unprecedented. Since May 1, nearly 20,000 laboratory-confirmed cyclosporiasis cases have been reported in the US, a figure 16 times higher than that recorded during the same period last year, according to Al Jazeera. At its peak, more than 1,000 infections were reported in a single day. The previous worst year for infections was 2019, when about 4,700 cases were reported across the country, as noted by the BBC.
The outbreak also had a significant economic effect on the US lettuce industry. Prices for the crop dropped dramatically over the summer due to decreased demand, falling 16.4% from June to July and a further 6.2% from July to August, according to The Guardian. This decline occurred as consumers, out of fear, cut back on not just lettuce but also other produce.
Food Safety Under Scrutiny
The cyclospora outbreak has renewed scrutiny of US food safety controls, including the government’s ability to identify contaminated produce before it reaches consumers, Al Jazeera reported. Concerns have been raised over a substantial decline in FDA inspections of foreign food facilities in recent years; the agency hit an all-time high of 1,700 inspections in 2019, less than one-tenth of its annual target of over 19,000. Additionally, the FDA did not inspect the implicated Mexican farm until approximately a month after the investigation began, and a rule designed to improve traceability of high-risk foods like leafy greens has been delayed until 2028.
Implications for UK Readers
While the immediate outbreak was in the US, UK health officials have warned about cases contracted by returning travellers, according to the BBC. This serves as a reminder for those travelling internationally to be aware of food safety precautions, especially in regions with reported outbreaks. While this specific lettuce recall is contained within the US, vigilance regarding food preparation and sourcing remains important to prevent foodborne illnesses, which can sometimes lead to local closures and health alerts.
Frequently Asked Questions
- Q: What is cyclospora?
A: Cyclospora is a microscopic parasite that causes an intestinal illness called cyclosporiasis, spread through contaminated food or water. - Q: How many people were affected by the recent US outbreak?
A: Nearly 20,000 confirmed cases have been reported since May 1, with over 1,000 hospitalisations and two deaths. - Q: What was the source of the outbreak?
A: The outbreak was linked to contaminated iceberg lettuce imported from central Mexico, supplied by Taylor Farms de Mexico. - Q: What are the main symptoms of cyclosporiasis?
A: The most common symptom is frequent, watery diarrhoea, along with loss of appetite, weight loss, stomach cramps, bloating, gas, nausea, and extreme tiredness.