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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.

According to UKHSA, some of the higher numbers may be attributable to the use of PCR multiplex technology, which can detect multiple gastrointestinal pathogens in one test.

Raw water carries the risk of serious gastrointestinal infection from a wide variety of pathogens.

The patient, who was originally treated for a cancerous brain tumour, said he had suffered fatigue, joint pain, gastrointestinal distress, recurrent mouth ulcers and nausea, because of the ongoing treatment.