Host preference of Phlebotomus argentipes in different biotopes

Area of Science:

• Medical entomology
• Parasitology
• Vector-borne diseases

Background:

• Phlebotomus argentipes is a primary vector of visceral leishmaniasis in South Asia.
• Understanding host-seeking behavior is crucial for effective vector control strategies.
• Previous studies suggest potential variations in the feeding patterns of P. argentipes.

Purpose of the Study:

• To investigate the host preference of P. argentipes in distinct ecological settings.
• To quantify the human blood index (HBI) of P. argentipes in cowsheds versus human dwellings.
• To determine if biotope influences the host-feeding behavior of P. argentipes.

Main Methods:

• Field-based entomological surveys were conducted to collect P. argentipes specimens.
• Flies were captured from two contrasting biotopes: agricultural cowsheds and residential human dwellings.
• The origin of blood meals in collected flies was identified using serological or DNA-based methods to determine the human blood index.

Main Results:

• The human blood index of P. argentipes collected from cowsheds was significantly lower (21.5%) compared to those collected from human dwellings (69.6%).
• This disparity highlights a clear difference in host-feeding behavior based on the collection biotope.
• P. argentipes demonstrates a notable degree of host-feeding plasticity.

Conclusions:

• Host preference of P. argentipes is not uniform and is significantly influenced by the surrounding biotope.
• The higher HBI in human dwellings suggests a greater propensity to feed on humans in close proximity.
• These findings have implications for targeted vector control interventions, emphasizing the need to consider local ecological factors.