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.
More top news
Rain clipping the far north through the evening but elsewhere staying dry with some sunny spells.
Public Health Wales figures show 25 more cases of the virus have also been confirmed.
Photos taken on Saturday morning show Roald Dahl Plass strewn with empty beer bottles and discarded canisters of laughing gas.