The primary objective of this trial is to test the hypothesis that ciprofloxacin monotherapy given (orally, intravenously, or combination) for 10 days is non-inferior to an aminoglycoside (given on days 1-3) followed by ciprofloxacin (given on days 4-10) in the treatment of bubonic plague. Secondary objectives are: \- to evaluate the level and kinetics of anti-Y. pestis antibodies of patients (bubonic and pneumonic plague) included in the study (anti-F1 ELISA techniques) at D1, D11, D21, M3 for patients who are positive at D21, and M12 for patients who are positive at M3. The tertiary objectives are: \- to evaluate the level and kinetics of the levels of anti-Y. pestis antibodies and circulating F1 antigen of the patients (bubonic and pneumonic plague) included in the study (Luminex MagPix techniques with a Multiplex containing anti-F1 and rLcrV antigens and an F1 antigen capture multiplex) at D1, D11, D21, M3 for patients positive at D21, and M12 for patients who are positive at M3. Observational non-comparative study of pneumonic plague * The primary objective is to document the efficacy and safety of the currently recommended combination therapy treatment of pneumonic plague - an aminoglycoside (streptomycin or gentamicin) and ciprofloxacin combination therapy. * The secondary and tertiary objectives of the bubonic plague trial also apply to the pneumonic plague cohort.
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Proportion of patients with bubonic plague with a therapeutic response (assessed on day 11).Therapeutic response is defined as follows for subjects with a visible bubo:
Timeframe: 11 days