Climate Change Induced Vulnerability to Malaria and Cholera in the Lake Victoria Region

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Climate Change Induced Vulnerability to Malaria and Cholera in the Lake Victoria Region Climate Change Induced Vulnerability to Malaria and Cholera in the Lake Victoria Region A Final Report Submitted to Assessments of Impacts and Adaptations to Climate Change (AIACC), Project No. AF 91 (Page intentionally left blank) Climate Change Induced Vulnerability to Malaria and Cholera in the Lake Victoria Region A Final Report Submitted to Assessments of Impacts and Adaptations to Climate Change (AIACC), Project No. AF 91 Submitted by Shem O. Wandiga Kenya National Academy of Sciences, Nairobi, Kenya. 2006 Published by The International START Secretariat 2000 Florida Avenue, NW Washington, DC 20009 USA www.start.org Contents About AIACC…………………………………………………………………….page vi Summary Project information………………………………………………….page vii Executive Summary……………………………………………………………...page ix 1 Introduction..................................................................................................................................................1 2 Characterisation of Current Climate and Scenarios of Future Climate Change ........................2 2.1 GEOGRAPHICAL AND CLIMATIC SETTING...........................................................................................2 2.1.1 Malaria and climate overview ..................................................................................................3 2.1.2 Cholera and climate Overview.................................................................................................4 2.2 ACTIVITIES CONDUCTED .......................................................................................................................5 2.3 DESCRIPTION OF SCIENTIFIC METHODS AND DATA...........................................................................5 2.3.1 Selection of malaria and cholera study sites..........................................................................5 2.3.2 Treatment of climatic and hydrological data.........................................................................8 2.4 MALARIA STUDY ....................................................................................................................................8 2.4.1 General climate and hydrological characteristics of the study sites.................................9 2.4.2 Interlinkages between climatic factors, hydrology, and incidence of malaria .............26 2.4.3 Modeling malaria transmission..............................................................................................31 2.4.4 Conclusion...................................................................................................................................32 2.5 CHOLERA STUDY..................................................................................................................................32 2.5.1 Climate and hydrological characteristics of the study site...............................................32 2.5.2 Regional signals of cholera and El Niño linkages ..............................................................42 2.5.3 Case studies ................................................................................................................................45 2.5.4 Synthesis of biophysical results..............................................................................................49 3 Socio-Economic Futures ..........................................................................................................................51 3.1 MALARIA STUDY ..................................................................................................................................51 3.1.1 Description of scientific and data collection methods.......................................................51 3.1.2 Results ..........................................................................................................................................52 3.2 CHOLERA STUDY..................................................................................................................................54 3.2.1 Description of scientific and data collection methods.......................................................54 3.2.2 Results ..........................................................................................................................................54 4 Impacts and Vulnerability......................................................................................................................56 4.1 MALARIA EPIDEMICS ...........................................................................................................................56 4.1.1 Self medication...........................................................................................................................56 4.1.2 Knowledge of disease ...............................................................................................................57 4.2 CHOLERA EPIDEMICS...........................................................................................................................57 4.3 VULNERABLE COMMUNITIES ..............................................................................................................60 4.4 CONCLUSIONS ......................................................................................................................................61 5 Adaptation ..................................................................................................................................................62 5.1 ACTIVITIES CONDUCTED .....................................................................................................................62 5.2 CONCLUSIONS ......................................................................................................................................62 6 Capacity Building Outcomes and Remaining Needs......................................................................66 7 National Communications, Science-Policy Linkages and Stakeholder Engagement.............67 8 Outputs of the Project ..............................................................................................................................69 8.1 OTHER PUBLICATIONS.........................................................................................................................69 8.2 PRESENTATIONS ...................................................................................................................................69 9 References ...................................................................................................................................................71 List of Tables Table 1: Geographical Positions of Stream flow Stations in Kericho Area ............................................3 Table 2: Linear Regression of Temperature Changes in the Lake Victoria Basin.................................9 Table 3: Direction of Trend in LOWESS Smooth for Temperature........................................................14 Table 4: Direction of Trend in the LOWESS Smooth for Precipitation.................................................20 Table 5: Flood Frequency Data for Sondu River........................................................................................25 Table 6a: Correlations Between Observed Rainfall and Climate Projections: 1961............................26 Table 6b: Correlations between Observed Temperature and Climate Projections: 1978-1990........26 Table 7: Comparison of Ranked Tmax and Tmin for the period (1978-1999) with El Niño and La Niña Years.................................................................................................................................................27 Table 8: Comparison of Ranked Mean Monthly Cumulative Precipitation with El Niño and La Niña Years.................................................................................................................................................28 Table 9: Seasonal trends in streamflow........................................................................................................42 Table 10: Selected Indicators of Vulnerability to Malaria Epidemics....................................................52 Table 11: Type of Health Facility Visited in Malaria Sites.......................................................................53 Table 12: Visits to Medical Facilities in the Last Three Months by Household Members in Malaria Sites.............................................................................................................................................................54 Table 13: Drugs bought for self treatment ..................................................................................................57 Table 14: Sources of Water..............................................................................................................................58 Table 15: Water Treatment Methods ............................................................................................................58 Table 16: Type of Toilet Facilities..................................................................................................................59 Table 17: Type of Health Facility Visited in Cholera Sites.......................................................................59 Table 18: Visits to Medical Facilities in the Last Three Months by Household Members ................60 Table 19: Cholera Control Strategies ............................................................................................................64 List of Figures Figure 1: Location of the malaria study
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