Visiting a farm is an enjoyable, However, such visits can never be free from all risks. Farm animals may carry a number of infections that can be harmful to people. Common types of illness include infection with Cryptosporidium parvum, E. coli O157 and Salmonella. Individual cases of illness and outbreaks linked to petting farms have been reported in North Yorkshire. Cases of E. coli O157 linked to farm attractions are at their highest levels between June and October. Illness ranges from diarrhoea to kidney failure and in some cases the illness can be fatal.