Write the ecological factors favourable for the transmission of Kala-azar.

Kala-azar, also known as visceral leishmaniasis, is a vector-borne disease transmitted by sandflies, particularly the female Phlebotomus species. Several ecological factors play a crucial role in the transmission of Kala-azar.

1. Temperature and Humidity: Sandflies thrive in warm and humid environments. Higher temperatures accelerate the development of the ______ ________ ____ __________ ________ ____ __________ ______ ______.
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