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Baseline malaria vector transmission dynamics in communities in Ahafo mining area in Ghana.

Dery DB, Asante KP, Zandoh C, Febir LG, Brown C, Adjei G, Antwi-Dadzie Y, Mahama E, Tchum K, Dosoo D, Amenga-Etego S, Adda R, Mensah C, Owusu-Sekyere KB, Anderson C, Krieger G, Owusu-Agyei S - Malar. J. (2015)

Bottom Line: It was also associated with bed net availability in the room (OR 1.39, 95%CI: 1.08-1.80, p = 0.01).The survey identified areas where intensified vector control activities would be beneficial.It also demonstrates that transmission in Asutifi and Tano is high even before the commencement of mining operations.

View Article: PubMed Central - PubMed

Affiliation: Kintampo Health Research Centre, Ghana Health Service, Ministry of Health, P.O. Box 200, Kintampo, Ghana. bonereme@gmail.com.

ABSTRACT

Background: Malaria vector dynamics are relevant prior to commencement of mining activities. A baseline entomology survey was conducted in Asutifi and Tano (referred to as Ahafo) in the Brong-Ahafo geo-political region of Ghana during preparatory stages for mining by Newmont Ghana Gold Limited.

Methods: Between November 2006 and August 2007, eight Centre for Disease Control light traps were set daily (Monday-Friday) to collect mosquitoes. Traps were hanged in rooms that were selected from a pool of 1,100 randomly selected houses. Types of materials used in construction of houses were recorded and mosquito prevention measures were assessed from occupants.

Results: A total of 5,393 mosquitoes were caught that comprised Anopheles gambiae (64.8%), Anopheles funestus (4.2%), as well as Culicines, comprising of Culex (30.4%) and Aedes species (0.6%). The entomological inoculation rate in Asutifi (279 infective bites/person/month) and Tano (487 infective bites/person/month) demonstrate relatively high malaria transmission in Ahafo. The presence or absence of Anopheles vectors in rooms was influenced by the type of roofing material (OR 2.33, 95%CI: 1.29-4.22, p = 0.01) as well as the presence of eaves gaps (OR 1.80, 95%CI: 1.37-2.37, p < 0.01). It was also associated with bed net availability in the room (OR 1.39, 95%CI: 1.08-1.80, p = 0.01). Over 80% of the houses were roofed with corrugated zinc sheets. Over 60% of the houses in Ahafo had no eaves gaps to give access to mosquito entry and exit into rooms and mosquito bed net coverage was over 50%. Other measures used in preventing mosquito bites included; coil (22.1%), insecticide spray (9.4%), repellent cream (4.0%) and smoky fires (1.1%), contributed minimally to individual mosquito preventive measures in impact areas. Similarly, levels of protection; coil (16.9%), insecticide spray (2.8%) and repellent cream (0.3%) for the non-impact areas, depict low individual prevention measures.

Conclusions: The survey identified areas where intensified vector control activities would be beneficial. It also demonstrates that transmission in Asutifi and Tano is high even before the commencement of mining operations. This study serves as baseline information to assess impact of mining activities in relation to future vector control interventions.

No MeSH data available.


Related in: MedlinePlus

Bi-monthly rainfall pattern in Asutifi and Tano area in Ghana (2006–2007).
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Fig2: Bi-monthly rainfall pattern in Asutifi and Tano area in Ghana (2006–2007).

Mentions: The study was conducted in two areas in the Brong Ahafo Region of Ghana; Asutifi and Tano (Figure 1). Asutifi lies between latitudes 6°40′ and 7°15′ North and Longitudes 2°15′ and 2°45′ West. Tano lies between latitudes 7°00′N and 7°25′ N and between longitudes 1°45 W and 2°30 W. Asutifi had a population of approximately 97,977 and land surface area of 1,500 square kilometres. Tano had a total population of approximately 155,100 at the time of survey. The study area falls within the wet semi-equatorial forest zone where mean annual rainfall is about 1200 mm per annum. The quarterly rainfall pattern in the area (Figure 2) depicts rainfall throughout the year and reflects two raining seasons in the area. The major economic activities in the study areas besides gold mining are farming of cash crops, such as cocoa, palm oil, yam and plantain.Figure 1


Baseline malaria vector transmission dynamics in communities in Ahafo mining area in Ghana.

Dery DB, Asante KP, Zandoh C, Febir LG, Brown C, Adjei G, Antwi-Dadzie Y, Mahama E, Tchum K, Dosoo D, Amenga-Etego S, Adda R, Mensah C, Owusu-Sekyere KB, Anderson C, Krieger G, Owusu-Agyei S - Malar. J. (2015)

Bi-monthly rainfall pattern in Asutifi and Tano area in Ghana (2006–2007).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4389860&req=5

Fig2: Bi-monthly rainfall pattern in Asutifi and Tano area in Ghana (2006–2007).
Mentions: The study was conducted in two areas in the Brong Ahafo Region of Ghana; Asutifi and Tano (Figure 1). Asutifi lies between latitudes 6°40′ and 7°15′ North and Longitudes 2°15′ and 2°45′ West. Tano lies between latitudes 7°00′N and 7°25′ N and between longitudes 1°45 W and 2°30 W. Asutifi had a population of approximately 97,977 and land surface area of 1,500 square kilometres. Tano had a total population of approximately 155,100 at the time of survey. The study area falls within the wet semi-equatorial forest zone where mean annual rainfall is about 1200 mm per annum. The quarterly rainfall pattern in the area (Figure 2) depicts rainfall throughout the year and reflects two raining seasons in the area. The major economic activities in the study areas besides gold mining are farming of cash crops, such as cocoa, palm oil, yam and plantain.Figure 1

Bottom Line: It was also associated with bed net availability in the room (OR 1.39, 95%CI: 1.08-1.80, p = 0.01).The survey identified areas where intensified vector control activities would be beneficial.It also demonstrates that transmission in Asutifi and Tano is high even before the commencement of mining operations.

View Article: PubMed Central - PubMed

Affiliation: Kintampo Health Research Centre, Ghana Health Service, Ministry of Health, P.O. Box 200, Kintampo, Ghana. bonereme@gmail.com.

ABSTRACT

Background: Malaria vector dynamics are relevant prior to commencement of mining activities. A baseline entomology survey was conducted in Asutifi and Tano (referred to as Ahafo) in the Brong-Ahafo geo-political region of Ghana during preparatory stages for mining by Newmont Ghana Gold Limited.

Methods: Between November 2006 and August 2007, eight Centre for Disease Control light traps were set daily (Monday-Friday) to collect mosquitoes. Traps were hanged in rooms that were selected from a pool of 1,100 randomly selected houses. Types of materials used in construction of houses were recorded and mosquito prevention measures were assessed from occupants.

Results: A total of 5,393 mosquitoes were caught that comprised Anopheles gambiae (64.8%), Anopheles funestus (4.2%), as well as Culicines, comprising of Culex (30.4%) and Aedes species (0.6%). The entomological inoculation rate in Asutifi (279 infective bites/person/month) and Tano (487 infective bites/person/month) demonstrate relatively high malaria transmission in Ahafo. The presence or absence of Anopheles vectors in rooms was influenced by the type of roofing material (OR 2.33, 95%CI: 1.29-4.22, p = 0.01) as well as the presence of eaves gaps (OR 1.80, 95%CI: 1.37-2.37, p < 0.01). It was also associated with bed net availability in the room (OR 1.39, 95%CI: 1.08-1.80, p = 0.01). Over 80% of the houses were roofed with corrugated zinc sheets. Over 60% of the houses in Ahafo had no eaves gaps to give access to mosquito entry and exit into rooms and mosquito bed net coverage was over 50%. Other measures used in preventing mosquito bites included; coil (22.1%), insecticide spray (9.4%), repellent cream (4.0%) and smoky fires (1.1%), contributed minimally to individual mosquito preventive measures in impact areas. Similarly, levels of protection; coil (16.9%), insecticide spray (2.8%) and repellent cream (0.3%) for the non-impact areas, depict low individual prevention measures.

Conclusions: The survey identified areas where intensified vector control activities would be beneficial. It also demonstrates that transmission in Asutifi and Tano is high even before the commencement of mining operations. This study serves as baseline information to assess impact of mining activities in relation to future vector control interventions.

No MeSH data available.


Related in: MedlinePlus