Infectivity rate of anopheles mosquito species and the community perception after indoor residual spraying programme in Awka and Environs, Anambra state, Nigeria

Abstract

The infectivity rate of anopheles mosquito species were studied after Indoor Residual Spraying (IRS) in three communities in the study area between April and December 2013. Indoor biting adult mosquitoes were collected using Pyrethrum Knockdown Collection (PKC). The physiological states of female anopheles mosquitoes collected indoors was determined using abdominal grading. The female anopheles mosquitoes were dissected for infection with sporozoites. Questionnaires were administration on 120 study participants to ascertain their perception about IRS. A total of 1,109 Anopheles mosquitoes were collected. Of this number, 1,044(94.14%) were Anopheles gambiae while 65(5.86%) were An. funestus. A total of 355(32.01%) anopheles mosquitoes were unfed, 513(46.26%) were freshly fed while 241(21.73%) were gravid. A total of 241 female anopheles mosquitoes were dissected and none was infective. All the 120(100.0%) respondents had heard about IRS, but a small proportion still had negative perceptions towards IRS. Adequate community sensitization is needed, prior to IRS.