(CNN)Federal health officials reported Thursday an additional 123 cases of cyclospora infection in an outbreak linked to McDonald’s salads that began in May.

The total number of laboratory-confirmed illnesses from this outbreak is now 286, according to the US Centers for Disease Control and Prevention. At least 11 of the sick individuals have been hospitalized.
The cyclospora parasite causes intestinal illness in someone who consumed contaminated food or water. Symptoms can begin a week or more after consuming the parasite.
They include diarrhea and frequent, sometimes explosive bowel movements, according to the CDC. Those who are infected might also experience loss of appetite, weight loss, stomach cramps or pain, nausea, gas and fatigue. Vomiting, headache, fever, body aches and flu-like symptoms can also occur.
The illness can last a few days to a few months, and patients might feel better but then get worse again. Cyclosporiasis can be treated with antibiotics.