A 32-year-old man from Bihar presents with a 3-month history of fever, weight loss, and abdominal distension. Investigations reveal pancytopenia and hepatosplenomegaly. Bone marrow aspiration shows intracellular amastigotes within macrophages. Regarding the epidemiology and transmission of Leishmania donovani (kala-azar), all of the following are true EXCEPT:

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