University of Khartoum

The effects of vector control interventions; long Lasting Insecticidal Nets plus Indoor Residual spraying (LLIN+IRS) and Long Lasting Insecticidal Nets (LLIN) alone on anopheles arabiensis Patton (Diptera: Culicidae) population densities, resting behaviors in central and eastern, Sudan

The effects of vector control interventions; long Lasting Insecticidal Nets plus Indoor Residual spraying (LLIN+IRS) and Long Lasting Insecticidal Nets (LLIN) alone on anopheles arabiensis Patton (Diptera: Culicidae) population densities, resting behaviors in central and eastern, Sudan

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Title: The effects of vector control interventions; long Lasting Insecticidal Nets plus Indoor Residual spraying (LLIN+IRS) and Long Lasting Insecticidal Nets (LLIN) alone on anopheles arabiensis Patton (Diptera: Culicidae) population densities, resting behaviors in central and eastern, Sudan
Author: Bakhiet, 1Mohamed Ahmed A M; El-Rayah, El-Amin; Abdalla, Eltagi A M; MA, Abdalmagid
Abstract: Introduction: Appropriate Understanding species composion, distribution and behaviours of malaria vectors are of great importance in vector control operations and they must be well understood to formulate specific and focused intervention strategies. In light of this it is important to investigate the distribution and behaviours of disease's vectors especially in rural areas of Sudan where the malaria is a pig health problem. This study was aimed to determine the species composion, abundance, densities and resting habits of vectors among the two interventions (study arms) LLINs alone and a combination of LLINs plus IRS in 30 clusters from four areas Alhoosh, Alhagabdalla, Galabat and New Halfa in central and eastern Sudan . Study design: A cluster randomized controlled trial, with two interventions (study arms) LLINs alone and a combination of LLINs plus IRS. Methodology: Mosquitoes samples were collected indoors using pyrethrum spray catches (PSC) from human dwellings and light trap collection method to determine density, resting habits, and species composion using Polymerase Chain Reaction Assays PCR to confirm the presence of sibling species of the Anopheles gambiae complex in four study areas in central and eastern Sudan. Results: Species identifications showed that 94.7 % (682 / 720) specimens were anopheles arabinoses patton species. The overall mean vector density was (7.9 ± 1.3± SE1.17 female / room / day) for LLIN study arm, while was (8.8 ± 1.7± SE1.53 female / room / day) for LLIN+IRS study arm.There was no significant difference between mean vector densities in the two study arms (P > 0.05). The species had tendency to rest indoor (endophilic) than resting outdoor (exophilic) the pool ratio was 1:2 for the two interventions, the ratio of fed to half- gravid / gravid females in the study arm LLIN was found 1: 1.9 and in the study arm LLIN+IRS was found 1: 2 in favour of fresh fed. While there is no difference between densities and resting place of anopheles arabiensis in study arms LLIN and LLIN+IRS, study areas and the study period . conclusion: The study revealed that anopheles arabiensis is the dominant vector of malaria in Sudan, tendency to rest indoor (indophilic) and there are no advantages of combining LLIN with IRS relative to use LLIN alone.
URI: http://khartoumspace.uofk.edu/123456789/25320


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