Increasing Resistance in Malaria Mosquitoes in Niger After Bed Net Distribution
Author Information
Author(s): Czeher Cyrille, Labbo Rabiou, Arzika Ibrahim, Duchemin Jean-Bernard
Primary Institution: CERMES (Centre de Recherche Médicale et Sanitaire), Institut Pasteur International Network, Niamey, Niger
Hypothesis
Did the nationwide distribution of long-lasting insecticide-treated nets (LLIN) in Niger lead to an increase in knockdown resistance mutations in Anopheles gambiae?
Conclusion
The study found a significant increase in the kdr-w mutation frequency in Anopheles gambiae populations in Niger following the implementation of LLINs.
Supporting Evidence
- Anopheles arabiensis specimens were found to be homozygous susceptible, while Anopheles gambiae S forms showed a high kdr-w frequency.
- The kdr-w mutation frequency increased significantly in the two wet seasons following the LLIN distribution.
- Host-seeking females exhibited higher kdr frequencies compared to resting females.
- Preliminary results indicated urban populations in Niamey had much higher kdr frequencies than rural sites.
Takeaway
After giving out special mosquito nets in Niger, the mosquitoes started to become more resistant to the insecticides, which could make it harder to control malaria.
Methodology
Mosquitoes were collected from 14 localities over three wet seasons, and DNA was analyzed to determine species and kdr-w mutation presence.
Potential Biases
Potential bias due to the collection methods and the limited sample sizes in some locations.
Limitations
The study could not monitor control sites without LLIN usage, limiting the ability to assess the direct impact of LLINs on kdr mutation frequency.
Participant Demographics
The study focused on Anopheles gambiae populations in various localities across Niger.
Statistical Information
P-Value
0.0014
Confidence Interval
95% CI not specified
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website