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Solomon Kibret, Matthew McCartney and Jonathan Lautze  Impact of the Koka Reservoir on Malaria Challenge Program on Water and Food, 2nd International Forum on Water and Food, Addis Ababa, Ethiopia  November 2008 Cover slide photo credit: Solomon Kibret (Koka reservoir), Jonathan Lautze
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Objectives of the study
The study area Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009.  Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia.  Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p.  (IWMI Research Report 132)
Climate Malaria is seasonally demarcated, with peak transmission following the long wet season, generally lasting from mid-September to mid-November.  Source: Created by S.Kibret using IWMI data, 2008
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Materials and Methods
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Materials and Methods…..
Photo Credit: Jonathan Lautze Photo Credit: Jonathan Lautze Photo Credit: Jonathan Lautze
Malaria cases passively reported in terms of proximity to the Koka Reservoir. Results Impact of the reservoir on malaria incidence Source: Preliminary figures compiled for Research report 132, S.Kibret 29.6-40.2 34.9 6-9 46.8-63.6 55.2 3-6 69.6-92.2 80.9 0-3 95% CI Annual  cases per 1000 persons Distance from reservoir (km)
Results…... Seasonal distribution of malaria cases: ,[object Object],[object Object],[object Object],Source: Lautze, J et al.. 2007.  Effect of a large dam on malaria risk: The Koka Reservoir in Ethiopia . Tropical Medicine and International Health, 12(8):982-989
Results…... Species of malaria: ,[object Object],[object Object],Source: Lautze, J et al.. 2007.  Effect of a large dam on malaria risk: The Koka Reservoir in Ethiopia . Tropical Medicine and International Health, 12(8):982-989   45.4 3,564 54.2 4,257 7,852 6-9 38.6 2,560 61.3 4,069 6,637 3-6 34.1 1,660 65.8 3,202 4,863 0-3 % No. % No. P. vivax P. falciparum   Total  Plasmodium  cases Distance from reservoir (km)
Results…... Impact of the reservoir on vector abundance   Larval abundance in reservoir and control villages Aug 2006 – Dec 2007.  ,[object Object],[object Object],Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009.  Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia.  Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p.  (IWMI Research Report 132)   3.1 – 16.5 9.8 0.5 – 4.1 2.3 Control Villages < 0.0001 19.8 – 46.4 33.1 <0.0001 9.3 – 21.1 15.2 Reservoir Villages p-value  95% CI Mean larval density  p-value 95% CI Mean number of positive larval sites
Results…... Seasonal  Anopheles  larval density in the reservoir and control villages.  Source: Preliminary figures created for Research Report 132, S. Kibret
Results…... Summary of adult  Anopheles  mosquitoes collected August 2006 and December 2007.  Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009.  Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia.  Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p.  (IWMI Research Report 132)   438 0 (0.0) 68 (15.5) 92 (21.0) 278 (63.5) Control Villages  2514 29 (1.2) 342 (13.6) 787 (31.3) 1356 (53.9) Reservoir Villages  Total An. funestus An. coustani An. pharoensis An. arabiensis
Results…... Density of  An .  arabiensis  and  An .  pharoensis  between August 2006 and December 2007  Source: Preliminary figures created for Research Report 132, S. Kibret
Results…... Bloodmeal sources of  Anopheles  mosquitoes, Aug 2006–Dec 2007  Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009.  Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia.  Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p.  (IWMI Research Report 132)   319  238 (74.6)  69 (21.6)  31 (9.7)  385  240 (62.3)  111 (28.8)  72 (18.7) 103  44 (42.7)  63 (61.2)  16 (15.5) 8  2 (25.0)  4 (50.0)  3 (37.5)  136  85 (62.5)  41 (30.1)  29 (21.3) 45  26 (57.8)  15 (33.3)  8 (17.8)  23  5 (21.7)  13 (56.5)  6 (26.1)  0  0  0  0 Reservoir   An. arabiensis An. pharoensis An. coustani  An. funestus Control  An. arabiensis  An. pharoensis An. coustani An. funestus No. tested  No. positive  No. positive  Unidentified for HB  for BB  Village  Species
Results…... Plasmodium   falciparum  sporozoite rates between August 2006 and December 2007  Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009.  Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia.  Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p.  (IWMI Research Report 132)   824  0.97  574  0.70  252  0.00  20  0.00  532  1.32  213  0.47  90  0.00  9  0.00  161  0.00  42  0.00  45  0.00  0  0 117  0.00  50  0.00  23  0.00  0  0 Ejersa Siree-Robe Gudedo Kuma An.  arabiensis  An. pharoensis  An. coustani  An. funestus no. tested  positive (%)  no. tested  positive (%)  no. tested  positive (%)  no. tested  positive(%) Village
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Conclusions * ITN: Insect Treated Net
Related Publications ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]

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Impact of the koka reservoir on malaria

  • 1. Solomon Kibret, Matthew McCartney and Jonathan Lautze Impact of the Koka Reservoir on Malaria Challenge Program on Water and Food, 2nd International Forum on Water and Food, Addis Ababa, Ethiopia November 2008 Cover slide photo credit: Solomon Kibret (Koka reservoir), Jonathan Lautze
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  • 4. The study area Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009. Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia. Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p. (IWMI Research Report 132)
  • 5. Climate Malaria is seasonally demarcated, with peak transmission following the long wet season, generally lasting from mid-September to mid-November. Source: Created by S.Kibret using IWMI data, 2008
  • 6.
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  • 8. Photo Credit: Jonathan Lautze Photo Credit: Jonathan Lautze Photo Credit: Jonathan Lautze
  • 9. Malaria cases passively reported in terms of proximity to the Koka Reservoir. Results Impact of the reservoir on malaria incidence Source: Preliminary figures compiled for Research report 132, S.Kibret 29.6-40.2 34.9 6-9 46.8-63.6 55.2 3-6 69.6-92.2 80.9 0-3 95% CI Annual cases per 1000 persons Distance from reservoir (km)
  • 10.
  • 11.
  • 12.
  • 13. Results…... Seasonal Anopheles larval density in the reservoir and control villages. Source: Preliminary figures created for Research Report 132, S. Kibret
  • 14. Results…... Summary of adult Anopheles mosquitoes collected August 2006 and December 2007. Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009. Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia. Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p. (IWMI Research Report 132) 438 0 (0.0) 68 (15.5) 92 (21.0) 278 (63.5) Control Villages 2514 29 (1.2) 342 (13.6) 787 (31.3) 1356 (53.9) Reservoir Villages Total An. funestus An. coustani An. pharoensis An. arabiensis
  • 15. Results…... Density of An . arabiensis and An . pharoensis between August 2006 and December 2007 Source: Preliminary figures created for Research Report 132, S. Kibret
  • 16. Results…... Bloodmeal sources of Anopheles mosquitoes, Aug 2006–Dec 2007 Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009. Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia. Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p. (IWMI Research Report 132) 319 238 (74.6) 69 (21.6) 31 (9.7) 385 240 (62.3) 111 (28.8) 72 (18.7) 103 44 (42.7) 63 (61.2) 16 (15.5) 8 2 (25.0) 4 (50.0) 3 (37.5) 136 85 (62.5) 41 (30.1) 29 (21.3) 45 26 (57.8) 15 (33.3) 8 (17.8) 23 5 (21.7) 13 (56.5) 6 (26.1) 0 0 0 0 Reservoir An. arabiensis An. pharoensis An. coustani An. funestus Control An. arabiensis An. pharoensis An. coustani An. funestus No. tested No. positive No. positive Unidentified for HB for BB Village Species
  • 17. Results…... Plasmodium falciparum sporozoite rates between August 2006 and December 2007 Source: Kibret, S.; McCartney, Matthew; Lautze, Jonathan; Jayasinghe, G. 2009. Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia. Colombo, Sri Lanka: International Water Management Institute (IWMI). 39p. (IWMI Research Report 132) 824 0.97 574 0.70 252 0.00 20 0.00 532 1.32 213 0.47 90 0.00 9 0.00 161 0.00 42 0.00 45 0.00 0 0 117 0.00 50 0.00 23 0.00 0 0 Ejersa Siree-Robe Gudedo Kuma An. arabiensis An. pharoensis An. coustani An. funestus no. tested positive (%) no. tested positive (%) no. tested positive (%) no. tested positive(%) Village
  • 18.
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  • 20.