Anti-bacterial agents   Anti-bacterial agents therapeutic use   Ceftriaxone   Doxycycline   Leptospirosis   Doxycycline therapeutic use   Ceftriaxone therapeutic use   Leptospirosis diagnosis   Leptospirosis drug therapy   Human   Female   Male   Adult   Middle aged   Aged   Retrospective studies   Young adult   Administration   Injections   Oral administration   India   Seasons   Polymerase chain reaction   Enzyme-linked immunosorbent assay   Immunoglobulin m   Immunoglobulin m blood   Leptospirosis complications   Weil disease   Leptospirosis microbiology   Weil disease complications