Michigan investigators now believe lettuce and salad greens are the leading source of a massive Cyclospora outbreak. While California has not reported a similar outbreak, health experts say shoppers should take extra precautions until the source is identified.
A major foodborne illness investigation has taken a significant turn, with health officials now pointing to lettuce and salad greens as the most likely source of a growing Cyclospora outbreak that has sickened thousands of people in Michigan.
Although the outbreak is centered in Michigan, the investigation has national implications. Federal officials have not yet identified the specific grower, supplier or brand responsible, meaning potentially contaminated produce could have moved through grocery distribution networks serving states across the country, including California.
For California families, the latest development does not mean there is a statewide outbreak. Instead, it serves as a reminder to use extra food safety precautions while investigators work to identify the source.
What’s changed?
Earlier this month, the Michigan Department of Health and Human Services warned consumers about a rapidly growing outbreak of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis.
Since then, investigators have narrowed their focus to lettuce and salad greens after reviewing interviews with patients and food exposure data. Officials believe contaminated leafy greens are the leading source of infection, but they have not linked the illnesses to any single farm, processor or brand.
Because the investigation is ongoing, no recall has been issued, and consumers cannot avoid the outbreak simply by steering clear of one specific product.
The Centers for Disease Control and Prevention and state health agencies continue working with food safety investigators to determine where the contamination occurred.
What this means for California
Parriva previously reported that California has confirmed Cyclospora infections this year but has not identified a statewide outbreak linked to the Michigan investigation.
Still, California residents should pay attention to the latest guidance.
Fresh produce sold in California often moves through the same national supply chains that serve the rest of the country. Until investigators identify the contaminated source, public health experts say shoppers should take reasonable precautions when buying and preparing leafy greens.
Los Angeles County residents, where ready-to-eat salads are a popular grocery and restaurant option, may also want to be more selective about raw leafy vegetables over the coming weeks.
Recommended precautions while the investigation continues
Health officials recommend several simple steps to reduce your risk.
Consider skipping bagged salad mixes
Instead of buying pre-packaged salad kits, choose whole heads of lettuce whenever possible.
Remove the outer leaves
Discard the outer two or three leaves before preparing lettuce. Those leaves are more likely to come into contact with contamination during harvesting and transportation.
Wash produce thoroughly
Rinse the remaining leaves under clean, running water before eating or cooking.
Although washing cannot guarantee the parasite is removed, it may help reduce contamination from dirt and other microorganisms.
Cook leafy greens when practical
Cyclospora is highly resistant to many routine sanitizing methods. Cooking vegetables to at least 158 degrees Fahrenheit (70 degrees Celsius) is considered the most effective way to destroy the parasite.
Wash your hands
Always wash your hands with soap and water before and after handling fresh produce. Alcohol-based hand sanitizers are not effective against Cyclospora.
Know the symptoms
Cyclospora infections usually appear about one to two weeks after eating contaminated food, making it difficult to identify the source.
Symptoms commonly include:
- Frequent watery diarrhea
- Severe fatigue
- Stomach cramps
- Nausea
- Loss of appetite
- Weight loss
- Bloating
Anyone experiencing prolonged or severe watery diarrhea should contact a healthcare provider and ask whether testing for Cyclospora is appropriate. Routine stool tests do not always detect the parasite.
Why no recall has been announced
Many consumers expect foodborne outbreaks to trigger an immediate recall, but that is not always possible.
Investigators must first determine exactly where contamination occurred. Because lettuce from multiple farms is often mixed during processing and distributed nationwide, tracing illnesses back to one supplier can take weeks.
Until investigators identify the source, officials say broad food safety recommendations are the most effective way to reduce additional illnesses.
Key facts
- Michigan investigators now believe lettuce and salad greens are the leading source of the Cyclospora outbreak.
- No specific brand, grower or supplier has been identified.
- No nationwide lettuce recall has been issued.
- California has not reported a statewide outbreak linked to the investigation.
- Consumers can lower their risk by choosing whole heads of lettuce, removing the outer leaves, washing produce, and cooking leafy greens when possible.
Federal and state investigators continue tracing the contaminated produce through the food supply chain. If a specific grower, distributor or product is identified, health officials are expected to issue additional public warnings or recalls.
In the meantime, California shoppers do not need to stop eating vegetables. Instead, experts recommend taking practical precautions until more information becomes available.
Previously on Parriva: We explained why California health officials say there is no confirmed statewide Cyclospora outbreak, how the parasite spreads, the symptoms to watch for, and when to seek medical care. That guide remains the best resource for readers looking for a complete overview while this investigation continues.
