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Tens of thousands of visitors due to attend a UK-wide open farm day this weekend have been warned about a parasitic infection that causes serious gastrointestinal illness.

The tiny, flattened and sluglike creatures can cause gastrointestinal problems, weight loss and lethargy when a person eats an infected fish.

The Environmental Protection Agency does not consider it a carcinogen; however, exposure to barium can cause gastrointestinal irritation, cardiovascular effects, kidney damage and respiratory problems.

Cryptosporidium is a parasite that can cause gastrointestinal illness, often linked to contact with animals, particularly young farm animals.

Longer and more intense workouts may cause increased gastrointestinal issues, like nausea and stomach discomfort, so trainers focus on consistent, moderately intense workouts.