Cyclospora on Fresh Produce and Herbs

Cyclospora is a microscopic parasite (Cyclospora cayetanensis) that causes cyclosporiasis, a gastrointestinal illness marked by prolonged, watery diarrhoea. In Australia it is most often linked to imported fresh produce and herbs, such as berries, leafy salads, coriander and snow peas, contaminated by faecally polluted water before harvest. Because ordinary sanitising does not reliably kill it, control depends on trusted sourcing, thorough washing and cooking where practical. Key takeaways: Cyclospora is a parasite spread through faecally contaminated water, and in Australia it is most often associated with imported fresh produce and fresh herbs eaten raw.. Unlike bacteria, it does not multiply on food and it is not spread person to person in a kitchen, but it is very hard to remove or kill once it is on produce.. Routine chemical sanitisers are not reliable against Cyclospora, so you cannot sanitise your way to safety; washing only reduces the load.. Sourcing from reputable suppliers with credible water and hygiene controls is the single most effective defence for a food business.. Thorough cooking to a core of 75C destroys the parasite, so cooking implicated produce, where the dish allows, removes the risk.. What is Cyclospora and cyclosporiasis? Cyclospora cayetanensis is a single-celled parasite that infects the small intestine and causes an illness called cyclosporiasis. People typically develop watery diarrhoea, stomach cramps, bloating, nausea, loss of appetite, fatigue and sometimes a low fever. Symptoms can be prolonged or come and go over days to weeks, which sets it apart from the short, sharp gastro caused by many bacteria. Anyone concerned about illness should seek medical advice, as diagnosis and treatment are decisions for a health professional. What makes Cyclospora unusual is its life cycle. The parasite is shed in faeces as an immature form (an oocyst) that is not yet infectious. It needs days to weeks in the environment, in warm, moist conditions, before it becomes able to infect a new person. That delay has two important consequences for a food business, explained below. It causes prolonged, often relapsing watery diarrhoea rather than sudden short-lived gastro.. It is a parasite, not a bacterium, so it behaves very differently on food.. Freshly shed oocysts are not immediately infectious; they must mature in the environment first.. Why imported fresh produce and herbs are the main risk Because freshly shed Cyclospora is not immediately infectious and needs time in the environment to mature, direct person-to-person spread inside a kitchen is not the concern it is for viruses like norovirus. Instead, contamination almost always happens earlier, out in the growing environment, when produce meets water or hands carrying mature oocysts. Water used for irrigation, spraying or washing at or near harvest is the classic route. That is why outbreaks overseas and in Australia have repeatedly been linked to fresh produce eaten raw, particularly items grown low to the ground or handled a lot: fresh herbs such as coriander and basil, leafy salads and pre-cut salad mixes, berries, snow peas and similar delicate crops. Produce imported from regions where sanitation and water quality are harder to guarantee carries a higher inherent risk, which is why sourcing matters so much. Contamination usually occurs before produce reaches you, via polluted irrigation or wash water.. Higher-risk items are typically eaten raw: fresh herbs, leafy salads, berries and snow peas.. Imported produce from areas with weaker water and sanitation controls carries greater inherent risk.. Why you cannot sanitise your way to safety It is tempting to assume a produce wash or a chemical sanitiser will solve the problem, but Cyclospora is stubborn. The parasite's protective oocyst wall makes it far more resistant than most bacteria to the sanitisers used in commercial kitchens, and to the chlorine levels typically found in produce washing. Treating a sanitiser rinse as a kill step for this hazard is a mistake. Washing still helps, and you should do it well, but its job here is to physically dislodge and rinse away contamination, not to disinfect. Thorough washing under running potable water, with agitation and time, reduces the number of oocysts on the surface. It cannot guarantee removal, especially from crinkled leaves and the crevices of herbs where oocysts lodge. That is why washing is a risk-reduction step, not a guarantee, and why it works alongside sourcing rather than replacing it. Common chemical sanitisers are not reliable against Cyclospora oocysts.. Washing physically removes some contamination but does not disinfect.. Textured leaves and herbs trap oocysts, so no wash fully guarantees removal.. Sourcing controls: your strongest defence Because you cannot see, wash or sanitise the hazard away with confidence, control starts before produce enters your kitchen. Under the Food Standards Code, and Standard 3.2.2 in particular, food businesses must take all practicable measures to source food from safe, reliable suppliers and to protect it from contamination. For a hazard like Cyclospora, supplier assurance is the practical heart of that duty. Build sourcing controls into your approved supplier arrangements. Favour suppliers who can describe their food safety and water controls, keep records of what you buy and from whom, and pay particular attention to high-risk raw items and imported fresh herbs and berries. Traceability is not just paperwork: if produce is ever implicated in illness or a recall, knowing exactly what you received, when and from where lets you act fast. Use an approved supplier list and prefer suppliers who can explain their water and hygiene controls.. Keep receiving records so every batch of high-risk produce is traceable to its source.. Apply extra scrutiny to imported fresh herbs, berries and pre-cut salads eaten raw.. Handling, washing and cooking in your kitchen Once produce is in your kitchen, good handling reduces risk even though it cannot undo contamination that is already present. Wash fresh produce thoroughly under running potable water immediately before use, separating and agitating leaves and herbs so water reaches the crevices. Do not soak washed and unwashed produce together, and keep produce away from raw meats and other contamination sources. The most reliable in-kitchen control is heat. Cooking produce so the centre reaches at least 75C destroys the parasite, so where a dish allows, cooking a higher-risk ingredient removes the Cyclospora risk entirely. For raw applications, such as garnishing with fresh coriander or serving berries and leafy salads uncooked, you cannot rely on a kill step, so sourcing and washing carry the load. Standard temperature controls still apply generally: keep cold food at or below 5C, hot food at or above 60C, and avoid leaving food in the 5-60C danger zone. Wash produce under running potable water right before use, agitating leaves and herbs.. Cook to a core temperature of 75C to destroy the parasite where the dish allows.. For raw dishes there is no kill step, so lean on trusted sourcing and thorough washing.. Records, recalls and responding to a problem Keeping simple records turns your controls into evidence and helps you respond quickly. Record deliveries of high-risk produce, your approved suppliers, and any washing or handling procedures in your food safety program. If a supplier or authority notifies you that a product is affected, your receiving records let you identify and withdraw the specific stock without guessing. Stay alert to recall notices. FSANZ publishes food recalls, and produce linked to parasites or contamination is sometimes recalled. If you hold recalled stock, remove it from use immediately and follow the recall instructions. If you suspect your business may be connected to illness, seek advice from your local council environmental health officer or state food authority, and preserve records and any remaining product so the source can be investigated. Log deliveries and suppliers so high-risk produce is traceable batch by batch.. Monitor FSANZ and supplier recall notices and act on affected stock straight away.. If illness is suspected, contact your local council or state food authority and keep records and samples.. Checklist: Approved supplier list in place, with extra scrutiny for imported raw herbs, berries and salads. Receiving records kept so high-risk produce is traceable batch by batch. Produce stored at or below 5C where required and protected from contamination. Fresh produce washed under running potable water immediately before use. Higher-risk produce cooked to a 75C core wherever the dish allows. Staff understand that sanitisers do not reliably kill Cyclospora. Recall notices from FSANZ and suppliers monitored and acted on. Common mistakes: Assuming a produce wash or chemical sanitiser kills Cyclospora; it does not reliably do so.. Relying on washing alone for raw dishes instead of controlling the risk through sourcing.. Treating imported fresh herbs and berries the same as lower-risk cooked ingredients.. Failing to keep receiving records, leaving you unable to trace or withdraw implicated stock.. Soaking or storing washed and unwashed produce together, spreading contamination..