Which organs is affected in kala azar?

In kala azar, the causative agent, Leishmania donovani, primarily affects the spleen, liver, and bone marrow.

Spleen: The spleen is the most commonly and severely affected organ in kala azar. It becomes enlarged, congested, and firm, often weighing several times its normal size. This enlargement can lead to abdominal discomfort, pain, and a feeling of fullness.

Liver: The liver is also commonly affected in kala azar. It becomes enlarged and congested, similar to the spleen. In severe cases, liver damage can occur, leading to jaundice, ascites (fluid accumulation in the abdomen), and impaired liver function.

Bone marrow: The bone marrow is the site where Leishmania parasites multiply and spread throughout the body. The infiltration of parasites into the bone marrow can lead to decreased production of blood cells, resulting in anemia, thrombocytopenia (low platelet count), and leukopenia (low white blood cell count).

In addition to these primary organs, kala azar can also affect other parts of the body, such as the skin, lymph nodes, and gastrointestinal tract. The specific symptoms and complications of kala azar can vary depending on the individual and the severity of the infection.