4400
Corticosteroid therapy is known to be hazardous in patients with occult infection but the mechanism by which the host parasite relationship is altered by steroids is not known . We have used an intestinal protozoal parasite , Giardia muris , to examine the effects of corticosteroids on the number of parasites in the intestine in the course of a primary infection .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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