What is Leptospirosis?
Leptospirosis is a dangerous bacterial disease caused by Leptospira bacteria. It can affect almost all animals and humans. It is a zoonotic disease, meaning animals can spread it to people.
Commonly affected animals:
Types of Leptospirosis in Animals
Leptospirosis is caused by different serovars (types) of Leptospira bacteria. Different animal species are commonly affected by different serovars.
1. Leptospirosis in Cattle
Common serovars:
Main problems
Cattle can become long-term carriers and shed bacteria in urine.
2. Leptospirosis in Dogs
Common serovars:
Main problems
Dogs are an important source of human infection.
3. Leptospirosis in Horses
Common serovars:
Main problems
4. Leptospirosis in Sheep and Goats
Common serovars:
Main problems
Many infections remain subclinical.
5. Leptospirosis in Pigs
Common serovars:
Main problems
Pigs can shed bacteria in urine for long periods.
6. Leptospirosis in Cats
Common serovars:
Main problems
Outdoor cats are at higher risk.
How does it spread?
The bacteria mainly spread through:
Animals become infected when bacteria enter through:
Rats and dogs are major sources of infection.
Where does the bacteria survive?
Leptospira survive best in:
They die quickly in:
What organs are affected?
Mainly:
Clinical Signs (Symptoms)
General signs
Kidney signs
Liver signs
Respiratory signs
Reproductive problems
Many animals may show only mild signs or no signs at all.
How is it diagnosed?
1. MAT Test (Microscopic Agglutination Test)
Detects antibodies against Leptospira.
2. PCR Test
Detects the bacteria directly in:
PCR + serology together give the best diagnosis.
Treatment
Antibiotics are usually effective if given early.
Commonly used antibiotics:
Supportive treatment may include:
Severe organ damage may become permanent.
Prevention
Vaccination
Vaccines are the best prevention method in:
Management
Zoonotic Risk (Risk to Humans)
Humans can get infected through:
People at higher risk:
Human symptoms
Pregnant women should avoid exposure because infection can harm the baby.
Safety Precautions
When handling suspected animals:
Key Points
Reference
This content has been written after reviewing the clinical knowledge and professional experiences of Katharine F. Lunn, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, as published on the MSD Veterinary Manual. As a veterinary doctor, I have carefully studied and summarized these expert-reviewed findings for educational and professional veterinary purposes.