126411
In a study performed on children with an impaired immune system , 30 % had lost the antibody after five years , and 8 % had already caught wild chickenpox in that five-year period .
 disease: impaired immune system
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: impaired immune system 
Answer:
 disease: impaired immune system