Pet Lovers Know About Leptospirosis the Threat Rises in North Bengal: Early Detection and Prevention Critical

KalimNews | 27 August 2025 : As the festive season approaches, North Bengal faces a potential public health crisis with the rising spread of leptospirosis, a dangerous bacterial infection previously unfamiliar to most locals. The disease has been reported across nearly 12 villages in Rajganj, including among the family members of healthcare workers. Experts stress that early detection, public awareness, and animal vaccination are key to preventing a broader outbreak.

What is Leptospirosis and Where Does It Come From?

Leptospirosis is a zoonotic disease caused by the spiral-shaped Leptospira bacteria. It can infect almost all mammals, including humans, dogs, cats, and livestock. There are 22 known species, 10 of which can infect humans. The most severe form is caused by Leptospira icterohaemorrhagiae.

The disease spreads through contact with urine from infected animals, particularly rodents, which act as silent carriers. It is also present in animals such as dogs, pigs, cattle, goats, sheep, and horses. These animals may not show symptoms but can contaminate the environment, especially during the monsoon season.

The disease is endemic in states like Kerala, Maharashtra, Gujarat, Tamil Nadu, and is increasingly being reported in West Bengal and Odisha.

How Does Leptospirosis Spread to Humans and Pets?

Routes of Transmission

Leptospirosis primarily spreads through:

• Direct contact with urine from infected animals

• Contaminated water or soil entering the body through cuts, scratches, or mucous membranes (eyes, mouth, nose)

• Wading through floodwaters or swimming in ponds, lakes, or rivers

• Handling infected pets or wildlife

• In rare cases, even sleeping beside infected pets can carry a risk

The monsoon season increases the risk due to waterlogging, which mixes contaminated waste into streets and fields.

Risks from Domestic Pets

Dogs can get infected by licking or drinking water or soil tainted with rat urine. Although human-to-dog transmission is rare, especially in countries like the U.S. or cities like NYC, experts still advise preventive vaccination for pets to reduce the risk of human exposure.

Who Is Most at Risk?

People with higher exposure to contaminated environments are especially vulnerable, including:

• Farmers and field workers

• Fishermen and canal workers

• Veterinarians and livestock handlers

• Sewage and drainage cleaners

• Laboratory technicians

• Pond users and those engaged in water-based religious activities

Recognizing Symptoms in Humans and Animals

In Humans

Symptoms appear about 7–10 days after infection. Early signs include:

• High fever

• Severe headache and nausea

• Vomiting and diarrhea

• Muscle pain

• Rashes, including hemorrhagic rashes

• Red eyes (conjunctival suffusion)

If untreated, the disease can progress into Weil’s syndrome, a severe form that can cause:

• Liver damage and jaundice

• Kidney failure

• Bleeding from the lungs or other organs

• Respiratory distress

• Meningitis-like symptoms

In extreme cases, organ failure or death can occur, especially without timely diagnosis.

In Pets (Especially Dogs)

• Sudden fever

• Vomiting

• Lethargy

• Diarrhea

• Jaundiced gums

• Behavioral changes or loss of appetite

Immediate veterinary care is essential if symptoms appear.

Diagnosis and Treatment

Testing

Diagnosis is done through blood tests, particularly Rapid ELISA or rapid diagnostic kits. In complex cases, advanced tests are needed—available only in major labs. Prompt suspicion and testing are critical.

Treatment

Leptospirosis responds well to common antibiotics like doxycycline or penicillin, especially when started early. Supportive care, including monitoring liver and kidney function, is crucial. Without treatment, fatality rates may reach up to 60%.

Doctors recommend:

• Urine tests to track blood content and organ recovery

• Avoiding misdiagnosis with dengue, typhoid, or viral fevers, which share similar symptoms

Vaccination and Preventive Measures

For Pets

• Vaccination is essential: A two-dose primary series (spaced 4 weeks apart) followed by annual boosters starting at 12 weeks of age

• Avoid exposure to stagnant or murky water

• Keep pets away from wild animals or rodent-infested areas

For Humans

• Avoid wading in flooded or contaminated water

• Use protective gear (boots, gloves) while working outdoors

• Wash hands thoroughly after handling pets or livestock

• Disinfect areas where pet urine may be present

• If a pet is diagnosed, inform your physician

There is no human vaccine available yet, and no preventive medicine that guarantees immunity. Therefore, behavioral precautions are vital.

Outbreak History and Lessons Learned

• In Mumbai, 2002, flooding led to hundreds of infections due to contaminated water exposure.

• In Baripada, 2002, nearly 200 people were affected. Thanks to early intervention by health workers, the outbreak was contained in under two weeks.

• Kolkata continues to report occasional cases during monsoons, particularly in waterlogged neighborhoods.

Kolkata continues to report occasional cases during monsoons, particularly in waterlogged neighborhoods.

Between 2015–2020, a high burden of 21,046 confirmed cases and 291 deaths was reported, highlighting leptospirosis as a significant public health concern (NCDC).

Early History and Endemicity

• 1929: The first report of leptospirosis in India came from the Andaman Islands.

• Late 1980s onwards: An increase in mini-epidemics was observed during monsoon months across various Indian states.

• Endemic states: Kerala, Tamil Nadu, Gujarat, Maharashtra, Karnataka, and the Andaman & Nicobar Islands continue to report recurring cases.

Key Takeaway: Early suspicion and community health worker vigilance are critical to containing outbreaks

Final Thoughts: Vigilance Saves Lives

Leptospirosis may be lesser-known, but its severity, rapid onset, and potential for fatal complications make it a public health priority. While the disease is treatable, early detection, prevention, and awareness are the best defenses.

Authorities urge residents—especially those in flood-prone or rodent-infested areas—to stay alert, practice hygiene, vaccinate pets, and consult healthcare professionals at the first sign of symptoms.