Michigan health officials reported a rapidly growing outbreak of cyclosporiasis, an intestinal illness caused by the Cyclospora parasite. The increase matters because the infection can cause prolonged gastrointestinal illness and officials had not yet identified the contaminated food or supplier responsible.

As of 4 July, 572 cases had been reported, with the sharpest rise in south-east Michigan. Cyclospora is generally contracted through food or water contaminated with faeces, and previous outbreaks have been linked to fresh produce; symptoms can include watery diarrhoea, stomach cramps, nausea and fatigue.