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Larval habitat characteristics of the main malaria vectors in the most endemic regions of Colombia: potential implications for larval control.

Conde M, Pareja PX, Orjuela LI, Ahumada ML, Durán S, Jara JA, Cañon BA, Pérez P, Beier JC, Herrera S, Quiñones ML - Malar. J. (2015)

Bottom Line: Overall, 17.5 % (195) of the potential larval habitats were found positive for different Anopheles species.The most widely distributed species was An. nuneztovari s.l., which was found mainly in human-made fishponds in Cordoba and temporary puddles in Valle del Cauca.Anopheles albimanus and An. calderoni were associated with human-made wells or excavation sites in Nariño.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, DC, Colombia. marcelaconde79@gmail.com.

ABSTRACT

Background: Malaria incidence has recently decreased globally and, as malaria elimination is envisioned as a possibility by the health authorities, guidance is needed to strengthen malaria control strategies. Larval source treatment, which could complement routine vector control strategies, requires knowledge regarding the Anopheles larval habitats.

Methods: A cross-sectional study was conducted in three of the most malaria-endemic regions in Colombia. A total of 1116 potential larval habitats in 70 villages were sampled in three states located in western Colombia: Cordoba, Valle del Cauca and Nariño.

Results: Overall, 17.5 % (195) of the potential larval habitats were found positive for different Anopheles species. A total of 1683 larvae were identified belonging to seven species: Anopheles albimanus, Anopheles calderoni, Anopheles darlingi, Anopheles neomaculipalpus, Anopheles nuneztovari s.l., Anopheles pseudopunctipennis, and Anopheles triannulatus. The most widely distributed species was An. nuneztovari s.l., which was found mainly in human-made fishponds in Cordoba and temporary puddles in Valle del Cauca. Anopheles albimanus and An. calderoni were associated with human-made wells or excavation sites in Nariño. Cordoba displayed the greatest Anopheles species diversity with a total of six species (Shannon diversity index H': 1.063). Although Valle del Cauca had four species, one more than Nariño, the diversity was lower because only one species predominated, An. nuneztovari s.l. The larval habitats with the highest Shannon diversity index were lagoons (H': 1.079) and fishponds (H': 1.009) in Cordoba, excavation sites in Nariño (H': 0.620) and puddles in Valle del Cauca (H': 0.764).

Conclusions: This study provides important information regarding the larval habitats of the main malaria vectors in the most malaria-endemic regions of Colombia, which will be useful in guiding larval control operations.

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Related in: MedlinePlus

Association between type of larval habitat in which Anopheles larvae were found and their temporality. Qualitative variable homology analysis (Pearson’s Chi squared test) showing in blue boxes positive and significant association (p < 0.05). Pink boxes negative and significant association, grey boxes no association (n = 173). *The larval habitats were sampled once in different months of the year
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Fig6: Association between type of larval habitat in which Anopheles larvae were found and their temporality. Qualitative variable homology analysis (Pearson’s Chi squared test) showing in blue boxes positive and significant association (p < 0.05). Pink boxes negative and significant association, grey boxes no association (n = 173). *The larval habitats were sampled once in different months of the year

Mentions: The analysis of contrast homogeneity for qualitative variables showed significant differences regarding the stability of the larval habitats; fishponds in Cordoba and excavation sites in Nariño were associated with permanent larval habitats, while in Valle del Cauca the puddles were associated with being temporary compared to other types of larval habitats inspected (Fig. 6).Fig. 6


Larval habitat characteristics of the main malaria vectors in the most endemic regions of Colombia: potential implications for larval control.

Conde M, Pareja PX, Orjuela LI, Ahumada ML, Durán S, Jara JA, Cañon BA, Pérez P, Beier JC, Herrera S, Quiñones ML - Malar. J. (2015)

Association between type of larval habitat in which Anopheles larvae were found and their temporality. Qualitative variable homology analysis (Pearson’s Chi squared test) showing in blue boxes positive and significant association (p < 0.05). Pink boxes negative and significant association, grey boxes no association (n = 173). *The larval habitats were sampled once in different months of the year
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4666185&req=5

Fig6: Association between type of larval habitat in which Anopheles larvae were found and their temporality. Qualitative variable homology analysis (Pearson’s Chi squared test) showing in blue boxes positive and significant association (p < 0.05). Pink boxes negative and significant association, grey boxes no association (n = 173). *The larval habitats were sampled once in different months of the year
Mentions: The analysis of contrast homogeneity for qualitative variables showed significant differences regarding the stability of the larval habitats; fishponds in Cordoba and excavation sites in Nariño were associated with permanent larval habitats, while in Valle del Cauca the puddles were associated with being temporary compared to other types of larval habitats inspected (Fig. 6).Fig. 6

Bottom Line: Overall, 17.5 % (195) of the potential larval habitats were found positive for different Anopheles species.The most widely distributed species was An. nuneztovari s.l., which was found mainly in human-made fishponds in Cordoba and temporary puddles in Valle del Cauca.Anopheles albimanus and An. calderoni were associated with human-made wells or excavation sites in Nariño.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, DC, Colombia. marcelaconde79@gmail.com.

ABSTRACT

Background: Malaria incidence has recently decreased globally and, as malaria elimination is envisioned as a possibility by the health authorities, guidance is needed to strengthen malaria control strategies. Larval source treatment, which could complement routine vector control strategies, requires knowledge regarding the Anopheles larval habitats.

Methods: A cross-sectional study was conducted in three of the most malaria-endemic regions in Colombia. A total of 1116 potential larval habitats in 70 villages were sampled in three states located in western Colombia: Cordoba, Valle del Cauca and Nariño.

Results: Overall, 17.5 % (195) of the potential larval habitats were found positive for different Anopheles species. A total of 1683 larvae were identified belonging to seven species: Anopheles albimanus, Anopheles calderoni, Anopheles darlingi, Anopheles neomaculipalpus, Anopheles nuneztovari s.l., Anopheles pseudopunctipennis, and Anopheles triannulatus. The most widely distributed species was An. nuneztovari s.l., which was found mainly in human-made fishponds in Cordoba and temporary puddles in Valle del Cauca. Anopheles albimanus and An. calderoni were associated with human-made wells or excavation sites in Nariño. Cordoba displayed the greatest Anopheles species diversity with a total of six species (Shannon diversity index H': 1.063). Although Valle del Cauca had four species, one more than Nariño, the diversity was lower because only one species predominated, An. nuneztovari s.l. The larval habitats with the highest Shannon diversity index were lagoons (H': 1.079) and fishponds (H': 1.009) in Cordoba, excavation sites in Nariño (H': 0.620) and puddles in Valle del Cauca (H': 0.764).

Conclusions: This study provides important information regarding the larval habitats of the main malaria vectors in the most malaria-endemic regions of Colombia, which will be useful in guiding larval control operations.

Show MeSH
Related in: MedlinePlus