: L iving ▁people ▁Category : Pe ople ▁from ▁Spring ▁Valley , ▁New ▁York ▁Category : American ▁players ▁of ▁Canadian ▁football ▁Category : American ▁football ▁running ▁back s ▁Category : Can ad ian ▁football ▁running ▁back s ▁Category : Del aware ▁State ▁Hor net s ▁football ▁players ▁Category : BC ▁L ions ▁players <0x0A> </s> ▁Ind oor ▁resid ual ▁sp ray ing ▁or ▁I RS ▁is ▁the ▁process ▁of ▁sp ray ing ▁the ▁inside ▁of ▁dwell ings ▁with ▁an ▁insect ic ide ▁to ▁kill ▁mos qu ito es ▁that ▁spread ▁mal aria . ▁A ▁dil ute ▁solution ▁of ▁insect ic ide ▁is ▁sp rayed ▁on ▁the ▁inside ▁walls ▁of ▁certain ▁types ▁of ▁dwell ings — th ose ▁with ▁walls ▁made ▁from ▁por ous ▁materials ▁such ▁as ▁mud ▁or ▁wood ▁but ▁not ▁pl aster ▁as ▁in ▁city ▁dwell ings . ▁Mos qu ito es ▁are ▁killed ▁or ▁rep elled ▁by ▁the ▁sp ray , ▁prevent ing ▁the ▁transmission ▁of ▁the ▁disease . ▁In ▁ 2 0 0 8 , ▁ 4 4 ▁countries ▁employed ▁I RS ▁as ▁a ▁mal aria ▁control ▁strategy . ▁Several ▁p estic ides ▁have ▁histor ically ▁been ▁used ▁for ▁I RS , ▁the ▁first ▁and ▁most ▁well - known ▁being ▁D DT . ▁ ▁World ▁Health ▁Organ ization ▁recommend ations ▁The ▁World ▁Health ▁Organ ization ▁( W HO ) ▁recomm ends ▁I RS ▁as ▁one ▁of ▁three ▁primary ▁means ▁of ▁mal aria ▁control , ▁the ▁others ▁being ▁use ▁of ▁insect ic ide ▁treated ▁bed net s ▁( IT N s