A 34-year-old nonpregnant woman presents with a 7-cm expanding annular erythematous lesion on her thigh after hiking in Connecticut. What is the first-line treatment?
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A
Doxycycline 100 mg twice daily for 10 days
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B
Ciprofloxacin 500 mg twice daily for 7 days
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C
Trimethoprim-sulfamethoxazole DS twice daily for 10 days
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D
Azithromycin 500 mg daily for 3 days