Kerala’s High Leptospirosis Burden

Leptospirosis has again become a major public-health concern in Kerala after the disease reportedly caused 50 deaths in July. The State has recorded the infection since 1989 and has faced an endemic burden for nearly three decades.

About Leptospirosis

Leptospirosis is a bacterial zoonotic disease caused by pathogenic Leptospira. It spreads through soil or water contaminated with the urine of infected animals and generally enters the human body through broken skin, abrasions or mucous membranes.

Why is Kerala a Hotspot?

• Heavy monsoon rainfall, frequent flooding, high humidity and year-round moisture favour the survival of Leptospira in soil and water.
• Lakes, canals and waterlogged areas increase human exposure to contaminated water.
• Rodents and other animal reservoir hosts frequently live close to farms and residential areas.
• Paddy cultivation, pineapple plantations and canal-cleaning activities expose agricultural and manual workers to infection.
• Strong surveillance, better diagnostic facilities and extensive reporting of confirmed and probable cases may also make Kerala’s burden appear higher than that of other States.

Most Vulnerable Groups

• Farmers, dairy workers and agricultural labourers.
• Sanitation workers and persons involved in canal cleaning.
• Construction and migrant workers employed in road projects.
• People belonging to lower socio-economic groups who frequently come into contact with contaminated soil and water.
• Urban residents engaged in gardening without protective gloves or footwear.

Why is the Fatality Rate Rising?

• Late diagnosis and rapid disease progression reduce the available treatment window.
• Severe cases may develop pulmonary haemorrhage and multi-organ failure within a few days.
• Initial symptoms resemble other tropical fevers, encouraging self-medication and delayed hospital visits.
• Existing antibody tests may not provide confirmation during the acute stage.
• PCR testing for early diagnosis is not widely available across all districts.
• Secondary-care hospitals may lack round-the-clock emergency facilities, intensive care and multidisciplinary support.
• Clinicians have also observed severe dysregulated immune responses and rapid cytokine storms in some post-COVID-era infections.

Kerala’s Prevention and Treatment Strategy

Kerala relies on doxycycline chemoprophylaxis, particularly for high-risk groups, and encourages early antibiotic treatment in patients presenting with fever and muscle pain without respiratory symptoms. However, poor compliance and limited adherence to Health Department advisories reduce the effectiveness of this strategy.

Suggested Improvements

• Identify occupation-specific vulnerable groups and conduct targeted prevention campaigns.
• Strengthen risk communication among farmers, sanitation workers and migrant labourers.
• Provide gumboots, heavy-duty gloves and other protective equipment.
• Expand access to early molecular diagnosis and emergency treatment facilities.
• Improve public adherence to prophylaxis and early-treatment advisories.