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Doxycycline and penicillin are the preferred antibiotics for treating leptospirosis, primarily due to their effectiveness against the Leptospira bacteria responsible for this disease. Doxycycline, a tetracycline antibiotic, is particularly useful for its ability to inhibit bacterial protein synthesis and has been shown to reduce the duration of leptospirosis symptoms when administered early in the illness. Penicillin is equally effective and has been a traditional choice for treating various bacterial infections, including those caused by Leptospira.

Both of these antibiotics can penetrate tissues where the bacteria reside and have a well-established efficacy in treating this specific infection, leading to a more favorable outcome for the patient. In contrast, the other antibiotic options listed are either less effective for this type of infection or are not first-line treatments recommended in clinical guidelines for leptospirosis management.