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Leptospirosis UPSC NOTE


What is leptospirosis?

  • Leptospirosis is a blood infection.

  • Caused by the bacteria Leptospira that can infect humans, dogs, rodents and many other wild and domesticated animals.

  • Weil's disease, the acute, severe form of leptospirosis, causes the infected individual to become jaundiced (skin and eyes become yellow), develop kidney failure, and bleed.

  • Bleeding from the lungs associated with leptospirosis is known as severe pulmonary haemorrhage syndrome.

What causes the disease?

  • The disease is caused by a bacterium called Leptospira interrogans, or leptospira. 

  • It is a contagious disease in animals but is occasionally transmitted to humans in certain environmental conditions.

  • The carriers of the disease can be either wild or domestic animals, including rodents, cattle, pigs, and dogs.

  • The cycle of disease transmission begins with the shedding of leptospira, usually in the urine of infected animals.

  • According to the U.S. Centers for Disease Control and Prevention, infected animals can continue to excrete the bacteria into their surroundings for a few months, but sometimes up to several years.

Which people are at risk?

  • Humans become part of the cycle when they come in direct contact with this urine of infected animals or indirectly, through soil and water that contain leptospira bacteria. 

  • A person is more likely to contract leptospirosis if they have cuts or abrasions on their skin.

  • The disease is also considered an occupational hazard for people working in agricultural settings, with animals, or in sanitary services that bring them into contact with contaminated water.

  • Recreational activities in contaminated lakes and rivers are also reported to increase the risk of leptospirosis.

What are the symptoms?

  • The severity of a leptospirosis infection ranges from a mild flu-like illness to being life-threatening.

  • The infection can affect many organs, reflecting the systemic nature of the disease. 

  • This is also why the signs and symptoms of leptospirosis are often mistaken for other diseases.

  • In milder cases, patients could experience a sudden onset of fever, chills, and headache – or no symptoms at all. 

  • But in severe cases, the disease can be characterised by the dysfunction of multiple organs, including the liver, kidneys, lungs, and the brain.

  • Animals exhibit a variety of clinical symptoms and indications. 

  • In cattle and pigs, the disease can potentially cause reproductive failure, stillbirths, and weak calves or piglets. 

  • Dogs experience a range of symptoms, including fever, jaundice, vomiting, diarrhoea, renal failure, and even death.

Environmental conditions

  • Seasonal patterns such as the onset of the monsoon can also potentially facilitate the disease’s incidence and transmission.

  • Ambient air that is more humid can help the pathogenic leptospira survive longer in the environment, thus increasing the risk of disease exposure in the community.

  • The incidence of the disease is also linked to extreme weather events like floods and hurricanes, when people are exposed to contaminated water.

  • Poor waste management, a high density of stray animals, faulty drainage systems, and unhygienic sanitation facilities are major drivers of the disease in urban areas.

  • In rural parts, these are contaminated paddy fields, dirty livestock shelters, and poor water-quality and sanitation.


  • Leptospirosis control can benefit from a ‘One Health’ approach.

  • ‘One Health’ is an interdisciplinary approach that recognises the interconnections between the health of humans, animals, plants, and their shared environment.

  • People who frequently interact with animals or their urine should exercise particular caution.

  • Such as by wearing personal protective equipment like gloves and boots. 

  • The same goes for workers in flooded fields where there’s a chance of being exposed to contaminated water. 

  • They should take extra care if they have cuts or abrasions on their lower extremities.

  • Preventing animals from getting infected is also important to reduce the risk of leptospirosis spreading and to limit farmers’ economic losses (when the disease causes reproductive failures in pigs and cattle). 

  • This in turn requires sanitary animal-keeping conditions, which is also desirable to improve the animals’ health and to prevent the spread of many diseases. 

  • Given the spike in leptospirosis during the monsoons, it is best to take precautions, including washing one’s arms and legs with an antiseptic liquid after handling animal waste and after working in water.

  • With ‘One Health’ in mind, public health professionals must work closely with the animal husbandry department to familiarise people about the dangers of leptospirosis, and create countermeasures that work for the health of both people and animals.



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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Leptospirosis UPSC NOTE
Leptospirosis UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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