15172
Tests in mice found that a toxin made by a rare strain of " C. perfringens " caused MS-like damage in the brain , and earlier work had identified this strain of " C. perfringens " in a human with MS. MS patients were found to be 10 times more immune-reactive to the epsilon toxin than healthy people .
 mice
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 mice