Background:

Understanding the impact of interventiontools on vector behaviour, host preference, resting,andinfectivity rates is paramountin malaria control planning. Magu district was one of the districts in lake zone regions in northwesternTanzania covered with indoor residual spray and long-lasting insecticidal nets in the main malaria control campaign. After interventions, this study evaluated the mosquito's host preference and resting behaviour in Lugeye village in rainy and dry seasons.

Methods:

Mosquitoes were collected both indoors and outdoors using the rest pots. The collection was done in both rainy and dry seasons. The samples were collected bi-weekly for three months each season.

Results:

A total of 254 mosquitoes were collected in both dry and rainy seasons, indoors and outdoors. The most abundant species were Anopheles funestuss.s. and An.arabiens is. Most blood meals from bovines reste doutdoors,while human blood meal sources rested outdoors. Sporozoite-positive mosquitoes were found only during the dry season.

Conclusion:

This study's findings have shown that implementing IRS and LLIN interventions has led to a species shift from An.gambiae s.s. to An.funestus and An.arabiensis. The inclusion of vector insecticide resistance informationcan be of paramount importance in appropriate intervention tool selection.