A growing outbreak of Cyclospora in the United States is being described as its worst on record, prompting public health concern in Australia. Both reports say the illness is caused by the parasite Cyclospora and is associated with outbreaks of severe diarrhoea described as explosive. Investigators are considering food as the likely source, with lettuce identified as a possible vehicle for transmission. The sources do not specify the number of cases, dates, or where in the US the outbreak is concentrated, but they link the rise in illness to contaminated produce and note that Cyclospora infections can spread when people ingest the parasite through contaminated food or water. The reports present the lettuce-to-outbreak link as a suspected cause rather than confirmed, reflecting ongoing investigation. Overall, the coverage focuses on the potential risk of similar foodborne outbreaks in Australia and the importance of monitoring guidance on food hygiene and handling while authorities determine the exact source and scope of the US outbreak.