Publications by authors named "Alexandra P M Shaw"

Gambiense human African trypanosomiasis (gHAT), a neglected tropical disease caused by a parasite transmitted by tsetse flies, once inflicted over 30,000 annual cases and resulted in an estimated half a million deaths in the late twentieth century. An international gHAT control program has reduced cases to under 1,000 annually, encouraging the World Health Organization to target the elimination of gHAT transmission by 2030. This requires adopting innovative disease control approaches in foci where transmission persists.

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Human African trypanosomiasis, caused by the gambiense subspecies of Trypanosoma brucei (gHAT), is a deadly parasitic disease transmitted by tsetse. Partners worldwide have stepped up efforts to eliminate the disease, and the Chadian government has focused on the previously high-prevalence setting of Mandoul. In this study, we evaluate the economic efficiency of the intensified strategy that was put in place in 2014 aimed at interrupting the transmission of gHAT, and we make recommendations on the best way forward based on both epidemiological projections and cost-effectiveness.

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The Global Burden of Animal Diseases (GBADs) is an international collaboration aiming, in part, to measure and improve societal outcomes from livestock. One GBADs objective is to estimate the economic impact of endemic diseases in livestock. However, if individual disease impact estimates are linearly aggregated without consideration for associations among diseases, there is the potential to double count impacts, overestimating the total burden.

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Background: Work to control the gambiense form of human African trypanosomiasis (gHAT), or sleeping sickness, is now directed towards ending transmission of the parasite by 2030. In order to supplement gHAT case-finding and treatment, since 2011 tsetse control has been implemented using Tiny Targets in a number of gHAT foci. As this intervention is extended to new foci, it is vital to understand the costs involved.

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Article Synopsis
  • Since 2012, the WHO and affected countries have aimed to eliminate Gambian human African trypanosomiasis (HAT) by using methods like case-finding, treatment, and vector control with tiny targets in places like Chad.
  • A cost analysis conducted in 2015 and 2016 showed that the annual operation for deploying tiny targets cost around USD 56,113, providing insights into expenses related to surveys, monitoring, and community sensitization in Chad.
  • The study concluded that using tiny targets is a cost-effective strategy for controlling tsetse flies in areas affected by gambiense HAT, with comparable costs to similar initiatives in Uganda.
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The burden of human diseases in populations, or for an individual, is frequently estimated in terms of one of a number of Health Adjusted Life Years (HALYs). The Disability Adjusted Life Year (DALY) is a widely accepted HALY metric and is used by the World Health Organization and the Global Burden of Disease studies. Many human diseases are of animal origin and often cause ill health and production losses in domestic animals.

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Increasing land use and associated competition for natural resources in the wake of high human and livestock population pressures have been major challenges confronting pastoralists of West Africa. This is especially true in Nigeria where Fulani make up 4% of the national population and prevailing national insecurity issues are impacting on pastoral livelihoods, including violent conflicts over land and ethnic, religious and political disparities. This study examined the dynamics of immigration within the Kachia Grazing Reserve (KGR), an exclusively Fulani pastoralist community in Kaduna State, northwest Nigeria, prompted by concerns from both the farming communities and the authorities about mounting pressure on existing limited resources, particularly in regard to availability of cattle grazing resources.

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This paper presents an in-depth investigation of the livelihood strategies of Fulani pastoralists in north central Nigeria. Results show a diversified crop-livestock system aimed at spreading risk and reducing cattle offtake, adapted to natural resource competition and insecurity by extensification, with further diversification into off-farm activities to spread risk, increase livelihood security and capture opportunities. However, significant costs were associated with extensification, and integration of crop and livestock enterprises was limited.

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Article Synopsis
  • The study in Kachia Grazing Reserve, Nigeria, examined the impact of increased Fulani families on local livestock practices and economic activities between 2011 and 2011.
  • Over half of the households sent their cattle away for seasonal grazing, even within the reserve, highlighting the reliance on livestock as the primary income source alongside crop farming and off-farm activities.
  • The arrival of new immigrant families led to changes in wealth distribution, with a shift towards more 'very poor' households, while emphasizing the importance of household size and marriage on livestock holdings, indicating the adaptation of livelihoods in response to environmental and political challenges.
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Background: Tsetse-transmitted African trypanosomes cause both nagana (African animal Trypanosomiasis-AAT) and sleeping sickness (human African Trypanosomiasis - HAT) across Sub-Saharan Africa. Vector control and chemotherapy are the contemporary methods of tsetse and trypanosomiasis control in this region. In most African countries, including Uganda, veterinary services have been decentralised and privatised.

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Introduction: To evaluate the relative effectiveness of tsetse control methods, their costs need to be analysed alongside their impact on tsetse populations. Very little has been published on the costs of methods specifically targeting human African trypanosomiasis.

Methodology/principal Findings: In northern Uganda, a 250 km2 field trial was undertaken using small (0.

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Article Synopsis
  • African Animal Trypanosomiasis (AAT) poses a significant threat to livestock in Nigeria, particularly in the Jos Plateau, where its initially tsetse fly-free status has changed due to recent invasions.
  • A study was conducted in 2008 using a longitudinal survey to assess the prevalence of bovine trypanosomiasis across different seasons, employing molecular techniques for parasite identification and community assessments regarding animal husbandry practices.
  • Results highlighted notable seasonal variations in disease prevalence, with three distinct village patterns identified: typical seasonal fluctuations, consistent prevalence throughout the seasons, and higher disease prevalence during the dry season.
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Introduction: Population screening for human African trypanosomiasis (HAT) is often based on a combination of two screening tests: lymph node palpation (LN) and card agglutination test for trypanosomiasis (CATT). This decision analysis compared the efficiency of three alternative detection strategies: screening by LN only, CATT only and their combination (LN and CATT).

Method: An HAT detection strategy was defined as the sequence of screening and confirmation.

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