3109
The antimicrobial of choice for initial prophylactic therapy among asymptomatic pregnant women exposed to Bacillus anthracis is ciprofloxacin , 500 mg twice a day for 60 days .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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