SEVEN people have now been tested positive for cryptosporidium after coming into contact with farm animals at Coleg Gwent’s farm in Usk.

16 others are under investigation who have attended the farm regularly or have come into contact with those who have.

An investigation into the outbreak by Public Health Wales, Monmouthshire County Council and Torfaen County Borough Council is ongoing.

Cryptosporidium is a parasite very common in young farm animals and is easily passed to those who into contact with them.

It causes watery diarrhoea, stomach pain, nausea and vomiting, and can last for up to a month. Healthy people will usually make a full recovery.

Heather Lewis, consultant in health protection for Public Health Wales, said: "We are continuing to work with Coleg Gwent, who have written to all students who may have been on the farm in March.

“As a precaution, Coleg Gwent have also cancelled a series of open days which were due to take place with invited primary schools between Tuesday 12th April and Friday 15th April.

"They have put in place a number of recommended control measures which include limiting college students’ access to animals when they return next week.”

Cryptosporidium can be prevented by thorough hand washing after coming into contact with farm animals, their bedding or dirty equipment.

Hand sanitisers or alcohol gel should not solely be relied on.

GPs in the area have been advised of the outbreak and asked to be alert to possible cases of diarrhoea or vomiting in people.

Anyone who is unwell with gastrointestinal symptoms is advised to contact their GP or NHS Direct Wales on 0845 46 47.

People who are unwell with vomiting or diarrhoea should not return to work or school for 48 hours after their symptoms have stopped.