<p>Methods: IRS was done in the month of February every year, we abstracted retrospective malaria data from KHIS MOH 706 Rev 2022 for the year 2021 and 2022 and tallied monthly aggregates of total tests done and the positivity rates among children less than 5 years in Rachuonyo North Sub County. We performed descriptive analysis and estimated the effect of the interventions and temporal changes of malaria positivity rate before and after IRS and nine months post IRS. We also compared the effect of the insecticide used during the IRS activity on malaria cases.</p>