Kala Azar: Symptoms, Causes, Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Sateesh Pydi , General Medicine

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Kala-azar, also known as visceral leishmaniasis, is a serious parasitic disease that affects internal organs. It can have a severe impact on health, leading to significant morbidity and mortality if left untreated.

The disease can weaken the immune system and cause chronic health complications, posing a serious threat to overall well-being. Early detection and proper management are crucial in preventing the adverse effects of kala-azar on health.

What Are the Types of Kala-Azar?

Leishmaniasis is a parasitic disease caused by different Leishmania species and is classified into several forms based on the part of the body affected. Kala-azar refers specifically to visceral leishmaniasis, the most severe form of the disease. Identifying the type of leishmaniasis helps doctors choose the most appropriate treatment and monitor for potential complications.

The main types include:

Visceral Leishmaniasis: Also known as kalaazar, it is the most severe form of leishmaniasis affecting the internal organs, particularly the spleen and liver.
Cutaneous Leishmaniasis: Causes skin sores and ulcers, usually on exposed body parts, and can lead to disfiguring scars if left untreated.
Mucocutaneous Leishmaniasis: Affects the skin and mucous membranes, leading to ulcers that can damage the nose, mouth, and throat.
Diffuse Cutaneous Leishmaniasis: Causes widespread skin lesions that do not heal on their own and can be challenging to treat.
Postkalaazar Dermal Leishmaniasis: Occurs in individuals who have recovered from visceral leishmaniasis, resulting in skin rashes and nodules.

What are the Symptoms of Kala-Azar?

Kala-Azar (visceral leishmaniasis) usually develops gradually over several weeks or months after infection. The symptoms can range from mild to severe and often worsen if left untreated.

Since the disease affects internal organs such as the spleen, liver, and bone marrow, early recognition of the symptoms is essential for timely diagnosis and effective treatment.

Common symptoms of Kala-Azar include:

Persistent or recurrent fever lasting for several weeks
Unexplained weight loss and reduced appetite
Enlarged spleen (splenomegaly) causing abdominal swelling or discomfort
Enlarged liver (hepatomegaly)
Fatigue and general weakness
Anemia, leading to pale skin, dizziness, and tiredness
Low white blood cell and platelet counts, increasing the risk of infections and bleeding
Darkening of the skin in some individuals, which is why the disease is commonly known as "Kala-Azar" or "black fever"
Prolonged illness with persistent symptoms if left untreated

What Causes Kala-Azar?

Kala-azar is caused by infection with Leishmania parasites, most commonly Leishmania donovani in India and neighboring countries. The parasites are transmitted to humans through the bite of an infected female phlebotomine sandfly.

Once inside the body, the parasites multiply in immune cells and spread to organs such as the spleen, liver, and bone marrow.

Parasitic infection
Sand fly bites
Weakened immune system
Poor living conditions
Malnutrition

When Should You See a Doctor for Kala Azar?

Consult an general physician if symptoms persist or worsen after visiting or living in an endemic area.

Fever lasting for more than two weeks
Unexplained weight loss or loss of appetite
Persistent fatigue or weakness
Enlarged spleen or liver causing abdominal swelling
Pale skin or symptoms of anemia
Frequent infections or unusual bleeding

Early diagnosis helps prevent complications and improve outcomes.

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How Is Kala-Azar Diagnosed?

Kala-azar is diagnosed through various methods that help identify the presence of the parasite causing the disease. Typically, healthcare providers will consider a combination of factors to make an accurate diagnosis. Symptoms experienced by the patient, such as prolonged fever, weight loss, and enlarged spleen, are key indicators.

Additionally, physical examinations and medical history play a crucial role in the diagnostic process. Various laboratory tests are also conducted to confirm the presence of the parasite in the body. These tests help healthcare professionals determine the appropriate treatment for the patient.

Blood tests
Bone marrow aspiration
Serological tests
PCR (Polymerase Chain Reaction) tests
Immunochromatographic tests

What Are the Best Treatment Options for Kala-Azar?

Treatment options for kala-azar typically involve medications aimed at killing the parasite causing the disease. Commonly used drugs include antimonials, amphotericin B, and miltefosine. Treatment duration and specific medications may vary based on the severity of the infection and individual patient factors.

It is important to follow the healthcare provider's recommendations closely to ensure effective treatment and recovery. In some cases, supportive care such as fluids and nutritional support may also be necessary. Regular follow-up visits are essential to monitor treatment progress and manage any potential side effects.

Antimonial Drugs: Antimonial drugs like sodium stibogluconate are the mainstay of treatment for kalaazar, helping to eliminate the parasite causing the disease.
Amphotericin B: Amphotericin B is an alternative treatment option for kalaazar, especially in cases of resistance to antimonial drugs.
Miltefosine: Miltefosine is an oral medication used to treat kalaazar and is particularly useful in regions where access to intravenous treatments like amphotericin B is limited.
Paromomycin: Paromomycin is another medication that can be used in the treatment of kalaazar, often in combination with other drugs to improve efficacy.
Liposomal Amphotericin B: Liposomal amphotericin B is a formulation of amphotericin B that is less toxic and more effective, making it a preferred treatment option for some patients with kalaazar.

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Who Is at Risk of Developing Kala-Azar?

Anyone exposed to infected sandflies can develop kala-azar, but certain factors significantly increase the risk of infection. The disease is more common in regions where sandflies are prevalent and where living conditions favor parasite transmission. Recognizing these risk factors can help with prevention and early diagnosis.

People at higher risk include:

Residents of or travelers to endemic regions, particularly parts of India, Bangladesh, Nepal, Brazil, East Africa, and Sudan.
People living in poor housing conditions where sandflies breed easily.
Individuals with weakened immune systems, including people with HIV/AIDS or those taking immunosuppressive medications.
Malnourished individuals, especially children, who have reduced immunity.
People living in overcrowded communities with limited access to healthcare and vector control measures.

Reducing exposure to sandfly bites and seeking prompt medical care for persistent fever or weight loss can help prevent serious complications.

Frequently Asked Questions

1. What is kala-azar?

Kala-azar, also known as visceral leishmaniasis, is a serious and often fatal disease caused by parasites transmitted through the bite of infected sandflies.

2. What are the symptoms of kala-azar?

Symptoms of kala-azar include prolonged fever, weight loss, enlarged spleen and liver, and anemia.

3. How is kala-azar diagnosed?

Kala-azar is diagnosed through blood tests to detect the presence of the parasite or antibodies against it.

4. What is the treatment for kala-azar?

The main treatment for kala-azar is medication with antimonial drugs or newer alternatives like liposomal amphotericin B.

5. Can kala-azar be prevented?

Preventive measures for kala-azar include controlling sandfly populations, using insect repellent, wearing protective clothing, and avoiding outdoor activities during dusk and dawn.