Is it true that asymptomatic animals can be carriers of Leptospira?

• A. True
• B. False
• C. Only in vaccinated animals
• D. Only in clinically ill animals

Answer: (A)

Leptospira can establish a carrier state in animals, meaning an animal can be infected and shed the organism in urine for weeks to months without showing illness. This renal-urine persistence makes the animal a reservoir, capable of contaminating the environment and transmitting the bacteria to other animals or humans through contact with urine, water, or soil. Because of this, asymptomatic animals can indeed spread Leptospira even if they appear healthy.

Vaccination helps prevent disease and may reduce shedding in some cases, but it does not reliably prevent all animals from becoming carriers. The key idea is that infection and carriage can occur without clinical signs, so asymptomatic animals can still be sources of infection.