Publications by authors named "Thumbi S"

East Coast Fever (ECF) is one of the leading causes of livestock mortality and reduced productivity across Eastern Africa, and while a live vaccine against it known as the Infection and Treatment Method has existed for three decades now, its adoption by affected communities remains low. This study sought to provide a detailed examination of the dynamics that shape Infection Treatment Method (ITM) vaccine adoption behaviours. The study examined individual, socio-cultural and ecological- level factors influencing ITM adoption using the socio-ecological model.

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Proper nutrition is vital for maintaining good health for all people across their lifespan, especially children and mothers, who are especially vulnerable due to their specific nutrient needs. Despite the necessity of improved nutrition for these groups, some members do not fully meet their recommended daily micronutrient needs, a challenge exacerbated by different socioeconomic, cultural, and communal constraints resulting in malnutrition. Iron deficiency anaemia is a major concern among children and mothers, especially in pastoralist communities, due to poor nutrition and other related factors.

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Background: Rabies remains a major public health problem in low- and middle-income countries. However, human rabies deaths are rarely laboratory-confirmed or sequenced, especially in Africa. Five human rabies deaths from Tanzania and Kenya were investigated and the causative rabies viruses sequenced, with the aim of identifying implications for rabies control at individual, healthcare and societal levels.

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Article Synopsis
  • Strengthening global health security requires effective vaccines and treatments against infectious diseases, with Toll-like receptor (TLR) agonists showing potential to enhance immune responses.
  • A systematic review of 653 studies identified 51 relevant studies, revealing that 82% focused on TLR agonists as vaccine adjuvants, while 18% explored them as therapeutic agents, with a strong emphasis on their effectiveness in stimulating immune responses in animals.
  • Although TLR agonists proved effective, only a few studies assessed their safety, highlighting the need for comprehensive safety evaluations before further clinical applications in animals.
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Introduction: Explanatory models of disease focus on individuals' and groups' understandings of diseases, revealing a disconnect between livestock keepers and animal health providers. Animal health providers rely on models grounded in their veterinary training and experience. At the same time, livestock keepers may construct models based on traditional knowledge and their lived experience with East Coast fever in their cattle herds.

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Rabies, a viral disease that causes lethal encephalitis, kills ≈59,000 persons worldwide annually, despite availability of effective countermeasures. Rabies is endemic in Kenya and is mainly transmitted to humans through bites from rabid domestic dogs. We analyzed 164 brain stems collected from rabid animals in western and eastern Kenya and evaluated the phylogenetic relationships of rabies virus (RABV) from the 2 regions.

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  • The article provides an overview of animal health surveillance in Kenya from 1944 to 2024, combining historical documents and literature to analyze its development and challenges.
  • Key milestones include the establishment of the Directorate of Veterinary Services in 1895, mandatory disease control efforts beginning in 1944, and the transition towards electronic surveillance since 2003.
  • While strengths of the system include a solid legislative framework and use of technology, weaknesses involve poor implementation of strategies, lack of standard definitions for diseases, and inadequate resources for effective surveillance.
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  • The goal for 2030 is to eliminate schistosomiasis as a public health issue, specifically targeting heavy-intensity infections in school-aged children to drop below 1%, with new guidelines extending this goal to include younger children and adults.
  • A study using two individual-based models examined the effectiveness of school-based vs. community-wide treatment strategies, determining the number of treatment rounds needed to reduce heavy infections, based on the percentage of the population that has never been treated (NT).
  • Results showed that in low to moderate transmission areas, EPHP can be achieved within 7 years if NT is below 10% or 5%, while high transmission areas require community-wide treatment with NT
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  • The WHO aims to eliminate onchocerciasis (river blindness) transmission by 2030, predominantly affecting sub-Saharan Africa, and relies on vector control and mass drug administration of ivermectin for this effort.
  • A systematic review and meta-analysis was conducted to assess studies on onchocerciasis transmission status in sub-Saharan Africa, focusing on criteria such as the presence of elimination reports or long-term ivermectin administration.
  • The research involved a thorough search of multiple databases and included a classification system to determine the status of foci regarding transmission elimination, while employing mixed-effects meta-regression models to find contributing factors.
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Middle East respiratory syndrome coronavirus (MERS-CoV) is endemic in dromedaries in Africa, but camel-to-human transmission is limited. Sustained 12-month sampling of dromedaries in a Kenya abattoir hub showed biphasic MERS-CoV incidence; peak detections occurred in October 2022 and February 2023. Dromedary-exposed abattoir workers (7/48) had serologic signs of previous MERS-CoV exposure.

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Background: Livestock-dependent communities in Africa's drylands disproportionately experience acute malnutrition, especially during drought seasons. We detail the design and implementation of the Livestock for Health (L4H) study aimed at determining the effect of providing livestock feed and nutritional counselling to prevent seasonal spikes of acute malnutrition.

Methods: The L4H study employed a 3-arm cluster randomized controlled trial to compare households in pastoralist settings in northern Kenya receiving livestock feeds during critical dry periods, with or without nutritional counseling, with control households.

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  • The study investigates the transmission dynamics of Rift Valley fever (RVF) in northern Kenya, focusing on human and livestock seroprevalence during non-epidemic years.
  • A total of 676 human and 1,864 livestock samples were tested, revealing RVF virus exposure rates of 28.4% in humans and 21.7% in livestock, with a very low detection of acute infection (IgM) in livestock.
  • Key findings highlight that factors like age and involvement in livestock slaughter increase RVF exposure, while environmental factors like rainfall and elevation also influence seropositivity, indicating a possible ongoing endemic cycle.
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Background: Nutrition-sensitive livestock interventions have the potential to improve the nutrition of communities that are dependent on livestock for their livelihoods by increasing the availability and access to animal-source foods. These interventions can also boost household income, improving purchasing power for other foods, as well as enhance determinants of health. However, there is a lack of synthesized empirical evidence of the impact and effect of livestock interventions on diets and human nutritional status in Africa.

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  • The study examines the effectiveness of SMS reminders in improving adherence to rabies post-exposure prophylaxis (PEP) among bite patients in rural eastern Kenya.
  • A comparison was made between two groups: one that received SMS reminders and another that did not, finding that those with reminders were three times more likely to complete their PEP doses.
  • Key barriers to compliance included financial constraints and forgetfulness, highlighting that SMS reminders could enhance healthcare delivery and aid in rabies elimination efforts.
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Rabies continues to kill an estimated 59,000 people annually, with up to 99% of human cases transmitted by domestic dogs. The elimination of human deaths from dog-mediated rabies is achievable by applying a One Health approach, and the framework to do this is outlined in Zero by 30: the Global Strategic Plan to end human deaths from dog-mediated rabies by 2030. To build on this global goal, and implement the approaches set out in Zero by 30, the United Against Rabies Forum was launched in 2020.

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Chikungunya fever (CHIKF) is an arboviral illness that was first described in Tanzania (1952). In adults, the disease is characterised by debilitating arthralgia and arthritis that can persist for months, with severe illness including neurological complications observed in the elderly. However, the burden, distribution and clinical features of CHIKF in children are poorly described.

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Growing empirical evidence indicates that financial anxiety causes reductions in short-term cognitive capacity. Results from urban communities in Delhi, India show sizable differences in the number of health events recalled between the poor and non-poor respondents over experimentally controlled recall periods. One explanation for this recall difference is 'poor memory'.

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  • * By mapping 944 primary, 94 secondary, and 4 tertiary healthcare facilities and analyzing travel times during peak and off-peak hours, the findings reveal that less than 70% of Nairobi's population can reach a health facility within 30 minutes during peak traffic.
  • * The analysis shows a concerning accessibility ratio, with limited healthcare professionals available per population, indicating that traffic congestion significantly hampers healthcare accessibility and emphasizes the necessity for collaborative solutions across sectors.
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There has been a renewed focus on threats to the human-animal-environment interface as a result of the COVID-19 pandemic, and investments in One Health collaborations are expected to increase. Efforts to monitor the development of One Health Networks (OHNs) are essential to avoid duplication or misalignment of investments. This Series paper shows the global distribution of existing OHNs and assesses their collective characteristics to identify potential deficits in the ways OHNs have formed and to help increase the effectiveness of investments.

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Background   Although rabies in dog bite patients is preventable through timely initiation of post-exposure prophylaxis (PEP), a number of barriers to achieving PEP exist. This study investigated the delays to initiation of PEP among dog bite patients in the emergency departments of two PEP centers in Uganda. Methods A cross-sectional study was conducted among dog-bite patients that presented to two selected rabies PEP centers.

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Background: Brucellosis is associated with massive livestock production losses and human morbidity worldwide. Efforts to control brucellosis among pastoralist communities are limited by scarce data on the prevalence and risk factors for exposure despite the high human-animal interactions in these communities. This study simultaneously assessed the seroprevalence of brucellosis and associated factors of exposure among pastoralists and their livestock in same households.

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Background: Post-exposure treatment for dog bites in humans aims at alleviating the risk of rabies and promoting wound healing. Wound healing may be complicated by bacteria. This study identified the different bacteria and their antibiotic susceptibilities in infected dog bite wounds (DBWs) in Uganda.

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