Four more people have been diagnosed with cryptosporidiosis linked to the outbreak at Greenmeadow Community farm in Cwmbran.
It brings the total number of cases to eight. All were either members of staff or volunteers who bottle fed unwell animals. The animals have now been removed from the farm.
Public Health Wales say extra control measures are in place to ensure that risks to farm visitors and staff are kept to a minimum.
Anyone who is unwell with gastrointestinal symptoms is advised to contact their GP or NHS Direct on 0845 46 47.
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