Two people have died in Michigan from complications linked to cyclosporiasis, an intestinal infection caused by the parasite Cyclospora cayetanensis. They are the first deaths associated with the large outbreak currently affecting the United States, where more than 18,000 cases have been reported since the start of the season, an exceptionally high figure compared with previous years.

Michigan health authorities have said that both victims had serious pre-existing conditions and that dehydration caused by diarrhoea may have worsened their condition. In the state, more than 11,200 cases have been reported, with almost 200 hospital admissions.

What is Cyclospora and how is it transmitted

Cyclosporiasis is caused by a microscopic parasite that can contaminate fresh produce and water. Unlike many intestinal infections, it is not spread directly from person to person: infection almost always occurs through the consumption of contaminated fruit, vegetables or water.

Symptoms include: