True or false: People are not at risk for Leptospira zoonosis after appropriate antibiotic therapy has been introduced.

• A. True
• B. False
• C. Not enough information
• D. Only in vaccinated individuals

Answer: (A)

Starting antibiotics for leptospirosis lowers the contagious potential because the treatment rapidly reduces the bacterial load in the body, especially in the blood and urine—the main routes by which Leptospira is shed and transmitted. When therapy is started, bacteremia diminishes quickly and urinary shedding decreases, so the person becomes much less likely to transmit the organism to others. In typical clinical scenarios, this makes ongoing zoonotic risk negligible after appropriate therapy has begun. There can be a brief period of residual shedding in some cases, but the overall infectious risk is greatly reduced once treatment starts, which is why the statement is considered true.