5905
The hygiene hypothesis suggests that various immunological disorders that have been observed in humans only within the last 100 years , such as Crohn 's disease , or that have become more common during that period as hygienic practices have become more widespread , may result from a lack of exposure to parasitic worms ( helminths ) during childhood .
 disease: Crohn 's disease; animal: helminths
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 disease: Crohn 's disease; animal: helminths