Pyrethroid and DDT Resistance and Organophosphate Susceptibility among Anopheles spp. Mosquitoes, Western Kenya oleh Christine L. Wanjala, Jernard P. Mbugi, Edna Ototo, Maxwell Gesuge, Yaw A. Afrane, Harrysone E. Atieli, Guofa Zhou, Andrew Githeko, Eugenia Lo