Human African Trypanosomiasis (HAT) occurs in 36 sub-Saharan Africa countries – dependant upon Tsetse fly ( Glossina spp ) vectors. The people most exposed to the tsetse fly and therefore the disease are in rural populations dependent on agriculture, fishing, animal husbandry or hunting. Cattle is the key mode of human-animal transmission. Occurs in two forms, a cronic form of that accounts for 95% of reported cases of sleeping sickness, and an acute form. Each form has different vectors, that in turn inhabitat different habitats , and use different modes of tranmission. After continued control efforts, the number of cases reported in 2009 has dropped below 10 000 for first time in 50 years . This trend has been maintained in 2010 with 7139 new cases reported.
Norm of private pharmaceutical companies handling the development of new drugs
Transcript of "Sleeping sickness ppt"
Evaluating the capacity of multi-scale institutions to cope with ‘sleeping sickness’ disease spreadEmmelie, Susanne, and Stephen Adaptive governance Stockholm Resilience Centre March 8, 2012
Sleeping sickness - Background• Human African Trypanosomiasis (HAT) occurs in 36 sub-Saharan Africa countries• Dependent upon Tsetse fly (Glossina spp) vectors.• Highest exposure in rural populations dependent on agriculture, fishing, animal husbandry or hunting. Cattle is the key mode of human-animal transmission.• Occurs in two forms, a cronic form of that accounts for 95% of reported cases of sleeping sickness, and an acute form. Each form has different vectors with different modes of transmission.• After continued control efforts, the number of cases reported in 2009 has dropped below 10 000 for first time in 50 years. This trend has been maintained in 2010 with 7139 new cases reported. Source: WHO
Social-Ecological Linkages I• Understanding mechanisms which produce pattern we observe (spread + periodic epidemics)• Spread is a function of increased transmission rates – Where is the number of Tsetse bites to humans maximised? – Where is the pathogen load in Tsetse flies highest?• Inherently low transmission rate between reservoirs (livestock, wildlife) and humans. - Transmission rate highest in low-population density areas (riverine habitat perfect for Tsetse vector) - Dramatic improvements to transmission rates can be achieved with small management interventions
Social-Ecological Linkages II• As in most diseases, there is a non-linearity associated with the system which produces jumps from low-level endemism to periodic epidemics.• Upheaval - Ecological or Social disruptions can bring about increased transmissions – pushing the system above a critical threshold which causes an epidemic. – Social upheaval often causes land-use change (e.g. discontinuation of livestock grazing creates new vegetation increase habitat for Tsetse) and social movements. – Good example – After Civil War in Uganda, dramatic increase in outbreak of HAT
Time trends of HAT Democratic Republic of Congo Angola
Systems approach• Link upheaval events to factors affecting transmission –these are one component of specific social-ecological interactions and feedbacks.• Factors which affect disease spread cut across many areas• Combating diseases necessitates cross-sectoral cooperation
Spatial and temporal scales Source: Berrang-Ford et al. 2005
ActorsLevel Actor Role • WHOGlobal WHO Directing and coordinating global health issues. Objective to eliminate HAT as public health problem. Runs a control and surveillance programme of HAT with cross-scale collaborations. • Pharmaceutical companies parthership with WHO aiming to distribute new and less toxic Aventis, Bayer HealthCareInternational In public-private drugs for HAT. WHO collaboration centers Involved in HAT research projects. • NGOs NGO’s Activities mostly in connection to HAT epidemics. Donor organizations Providing financial support • Research communities security and national health care. Coordination of WHO control andNational National governments Providing monitoring programmes. NGO’s Activities mostly in connection to HAT epidemics • Endemic countriesLocal/Regional Local authorities Health providing services NGO’s Intervention in prevention and control • Livestock owners Local population, livestock Impacting the conditions for disease transmission and land owners
Institutions InstitutionsInternational Norms on drug development Pricing policies and other international policies Constitutions Rules regulating: -Pharmaceutical market -Drug affordability -Public-private partnershipsNational Social norms on land-use National policies Rules regulating: -Pharmaceutical distribution systems -Land-use changes -National health care -Public-private partnershipsLocal Social norms on land-use Knowledge and health seeking behaviour of consumers Rules regulating: -Land-use changes -Drug affordability -Access to drugs and vaccines
Anatomy of Misfits (Galaz et.al. 2008)• Question 1 – At what scales does the disease (and factors affecting transmission) operate?• Question 2 – At what scales do the institutions operate?• Look at four key factors: Land-use Change, Conflict, Drug availability, & Climate Change• Look for spatial, temporal, and cascade misfits.
Land-Use Change• Land-use change occurs at different scales – the most relevant (and the clearest patterns observed) are the national and regional scale.• Factors that affect land-use change (market demand, climate change, crop-raiding) act across national boundaries.• Institutional capacity to constrain land-use change acts on national scale and downwards• There exists a spatial misfit. Governments have little power to affect these international, external, drivers.
Conflict• Conflict occurs at regional (Uganda) or national scale (Congo) - Also has trans-boundary effects (refugees).• Institutions (conventions) exist an international scale. - International lack of willingness to enforce those rules. Not a problem with misfits per se.• However, institutions and enforcement capacity often react very late to prevent conflict (e.g. Kosovo).• There exists a temporal misfit. A delay in response time that stems from structural rules of the UN (veto).
Drug Availability• Key issue: Lack of market demand for neglected disease medicines.• Norms at the international scale govern drug development – ‘only private sector can make drugs’.• Affected nations’ ability to access medicines undermined by the combination of these two issues.• Is this a spatial misfit?
Climate change• Familiar concept. International institutions not capable of preventing free-riding on the level of the nation state. Spatial misfit• Temporal misfit. International institutions not adapting sufficiently fast to react to risk of catastrophic climate change.• Cascade misfits. Climate change affects social- ecological interactions on multiple scales, through cascading effects (e.g. droughts affecting food supply that affects nutrition and lack of disease resistance).
Number of new reported cases T.b. gambiense 2011 Source: WHO 2011
International regimes• Is the problem an issue of norms? – Dominating norm is that the private sector is in the best position to develop drugs. – But for the diseases with low profitability, this is a governance failure.• Rise in public private partnerships & public- sector led drug development – Changing norms peoples’ mental models accepting new forms of drug development governance.
ConclusionNot addressed:•Political-institutional dimension not addressed•Social networks or bridging organizationsHowever:•Through the misfit analysis and international regimesand institutions we get an understanding the benefits ofhybrid transnational governance networks andinstitutions•Useful for a systemic approach towards neglecteddiseases