Public Health England has issued the following warning after an outbreak of cryptosporidium at Gaston Farm in Slindon.
While the farm has now been closed to the public, there is a chance that local residents may have visited the farm for the lambing.
Symptoms can take can take up to two weeks to emerge so PHE is urging people to remain vigilant if they or their family have visited the farm between March 17 and April 11.
Anyone who is concerned about vomiting and diarrhoea symptoms should phone NHS 111 or your GP for advice.
Specialists from Public Health England (PHE) South East are warning people to be aware of a serious stomach infection caused by cryptosporidium after at least 14 people fell ill following visits to a farm in West Sussex.