Diseases related to the human gastrointestinal tract, like diarrhea or other enteric illness, often spread through the fecal-oral route and are especially common in places where children have not completed toilet training.[2] Diapers, confined spaces for changing diapers, and the unhygienic habits of children contribute to the spread of these infections.[2] Bacterial infections most often spread through person to person contact, while eating food, or through the presence of animals.[2] It is difficult to determine how viral agents causing enteric illness spread.[2] Reviews of Helicobacter pylori have been unable to determine how it spreads during childcare, but have confirmed that it does easily spread in childcare environments, and that it is difficult to make recommendations for preventing it.[3]