On Friday, the number of cases of cryptosporidium rose to 186, up 12 on Thursday.

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About five cases of Cryptosporidium and Campylobacter have been reported on the island during the past three months.

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More than 80 people have been diagnosed as suffering from symptoms of cryptosporidium on the outskirts of Belfast.

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Cryptosporidium was found in water from the Mugdock Reservoir in Milngavie, East Dunbartonshire.

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"It is also important for anyone suffering from diarrhoea to avoid swimming pools as Cryptosporidium can survive in chlorinated water".

BBC: Isle of Man illnesses 'connected to animal rescues'

Warning notices have been sent out advising residents and businesses of the cryptosporidium problem and of the importance of boiling water.

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Thomson accepted its liability in the salmonella cases in September of last year, but argued that in the cases of cryptosporidium, it could not have done more to get rid of the illness from the resort.

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The 254-nanometer light kills the hardy waterborne polio virus, rotavirus (which causes vomiting, diarrhea and dehydration), the bacterium that causes cholera, the virus that gives rise to hepatitis A, and cysts of cryptosporidium (a nasty parasite).

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Among those affected was Carrie Dickens, from East Sussex, whose 13-year-old son George was taken seriously ill during their stay at the Son Baulo and was finally diagnosed with cryptosporidium and salmonella at their local hospital in Brighton.

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Cryptosporidium is a disease that is very common in young farm animals and can easily be passed to people who come into contact with those animals- it can lead to sickness and diarrhoea, but is rarely a serious condition for healthy people.

BBC: Isle of Man illnesses 'connected to animal rescues'