983
The antimicrobial activity was tested against 14 Gram - positive clinical strains , 2 ATCC Gram - positive strains , 10 Gram - negative clinical strains and 4 Gram - negative ATCC strains .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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