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Bacteria such as E. coli and Salmonella, or parasites like Cryptosporidium and Giardia, also cause severe diarrhea that can lead to dangerous levels of dehydration.

McAfee’s milk is highly regulated by the state of California, which performs frequent testing for food-illness pests such as campylobacter, cryptosporidium, E. coli, listeria, brucella and salmonella and other bacterial illnesses in his milk.

A £1.2m fund to help boost tourism and repair "reputational damage" after a cryptosporidium outbreak in south Devon has been described as "desperately important".

Also in May, thousands of residents in Devon were told to drink bottled water after their supply was contaminated with the cryptosporidium parasite - possibly as a result of a faulty valve on private land.

Consumption of water contaminated with human or animal faeces exposes people to parasites and bacteria such as cryptosporidium and E.coli, which cause diarrhoea and vomiting, or viruses like hepatitis A which can lead to liver infection.