Publications by authors named "Jan Hattendorf"

Background: The emergence and spread of Extended-Spectrum Beta-Lactamase (ESBL)-producing Escherichia coli pose significant challenges for treatment of infections globally. This challenge is exacerbated in sub-Saharan African countries, where the prevalence of ESBL-producing E. coli is high.

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Introduction: Cholangiocarcinoma (CCA) is a major contributor to hepatobiliary mortality in the Lao People's Democratic Republic (Lao PDR). Infection with the carcinogenic trematode Opisthorchis viverrini (OV), acquired through consumption of insufficiently-cooked river fish, is a known risk factor for the development of CCA. Together with OV, other risk factors contribute to the pathogenesis of CCA.

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  • The World Health Organization (WHO) aims to eliminate schistosomiasis globally by 2030, with chemical control of the Bulinus snail species being a key strategy for reducing transmission on Pemba Island, Tanzania.
  • Conducted malacological surveys among water bodies over three years found that the presence of Bulinus was influenced by environmental factors, with a notable decrease in their presence following niclosamide treatment.
  • The study observed variable infestation levels across different hotspots and identified a pattern where some water bodies saw recurring Bulinus even after initial control measures were applied.
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Trichuris trichiura, a soil-transmitted helminth (STH), often persists after a single dose of anthelminthic treatment. To overcome limited efficacy against T. trichiura of benzimidazoles (albendazole or mebendazole), the primary drugs used in mass drug administration (MDA) campaigns, the World Health Organization endorses the use of a combination of ivermectin and albendazole as a more effective treatment to be used for preventive chemotherapy.

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Background: Elimination of schistosomiasis as a public health problem and interruption of transmission in selected areas are goals set by the World Health Organization for 2030. Behaviour change communication (BCC), coupled with other interventions, is considered an essential measure to reduce the transmission of Schistosoma infection. Focusing on elimination, we assessed the 1-year impact of BCC interventions on schistosomiasis-related knowledge, attitude and practices (KAP) of schoolchildren in hotspot schools versus low-prevalence schools that did not receive the interventions.

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  • Urinary tract infections (UTIs) are common during pregnancy and can negatively impact health, but their prevalence in rural communities like San Marcos, Peru is not well understood.
  • A study involving 250 pregnant women revealed a UTI prevalence of 27.6%, higher than other areas in Peru, despite 96% of women accessing antenatal care services.
  • The results indicate that while there are no significant risk factors linked to UTIs in this population, routine UTI screenings during antenatal visits are essential to improving maternal health outcomes.
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  • * A study involving 299 adult pastoralists revealed that 17.0% of males and 34.7% of females reported experiencing chronic pain, with prevalence increasing with age.
  • * The most affected body parts were the knees, lower back, and head, suggesting the need for tailored health interventions to address chronic pain specifically for pastoralists and improve their quality of life.
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  • Schistosomiasis is a significant public health issue in sub-Saharan Africa, linked to poverty and environmental conditions; this study aimed to assess the prevalence of Schistosoma mansoni and how water-related activities impact disease spread.
  • The cross-sectional study conducted in western Côte d'Ivoire involved 1602 stool samples and 1729 urine samples from children aged 5-14, alongside observations of water activities and interviews with local leaders and health workers.
  • Results showed a 27.4% prevalence of S. mansoni, with higher rates found in certain health districts; children aged 9-14 were at greater risk, particularly in environments where water-related activities occurred, such as washing clothes near contamination sources.
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Background: Human hookworm is a cause of enormous global morbidity. Current treatments have insufficient efficacy and their extensive and indiscriminate distribution could also result in drug resistance. Therefore, we tested the efficacy and safety of emodepside, a strong anthelmintic candidate that is currently undergoing clinical development for onchocerciasis and soil-transmitted helminth infections.

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Background: After decades of praziquantel mass drug administration (MDA), several countries approach schistosomiasis elimination. Continuing MDA in largely uninfected populations no longer seems justified. Alternative interventions to maintain the gains or accelerate interruption of transmission are needed.

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  • * Conducted between June and August 2023, the study screened patients for S. haematobium infection at four health facilities on Pemba Island and gathered insights from healthcare staff regarding their knowledge and practices related to the disease.
  • * Results revealed a low infection rate of 1.1% among screened patients, but notable pelvic pain was reported. Healthcare staff demonstrated a good understanding of symptoms and treatment methods, indicating a need for enhanced resources for effective diagnosis and management of schistosomiasis.
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There is an urgent need for interventions in addressing the rapid and disproportionate impact of antimicrobial resistance (AMR) and climate change (CC) on low- and middle-income countries. Within this context, it is important to understand indigenous knowledge in rural communities, which are highly affected. This study examined knowledge, attitude, and practices (KAP) regarding AMR and CC in the Adadle district, Somali region, Ethiopia, utilizing mixed methods, including 362 surveys and 12 focus group discussions among rural communities.

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Background: During the last two decades, Caesarean section rates (C-sections), overweight and obesity rates increased in rural Peru. We examined the association between pre-pregnancy body mass index (BMI) and C-section in the province of San Marcos, Northern Andes-Peru.

Methods: This is a prospective cohort study.

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Background: Hand hygiene is crucial in health care centers and schools to avoid disease transmission. Currently, little is known about hand hygiene in such facilities in protracted conflict settings.

Objective: This protocol aims to assess the effectiveness of a multicomponent hand hygiene intervention on handwashing behavior, underlying behavioral factors, and the well-being of health care workers and students.

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Background: Control efforts of soil-transmitted helminthiases rely primarily on large scale administration of anthelminthic drugs. The assessment of drug efficacies and understanding of drug behavior is pivotal to the evaluation of treatment successes, both in preventive chemo-therapy programs as well as in research of novel treatment options. The current WHO guidelines recommend an interval of 14-21 days between the treatment and follow-up, yet no in-depth analysis of egg excretion patterns of Trichuris trichiura after treatment has been conducted to date.

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Background: Steatotic liver disease (SLD) prevalence is rising worldwide, linked to insulin resistance and obesity. SLD prevalence can surpass 10% even among those with normal weight. In Lao People's Democratic Republic (Lao PDR), where (OV) trematode infection and type 2 diabetes mellitus (T2DM) are common, infection related liver morbidity such as cholangiocarcinoma (CCA) is high, but data on SLD prevalence is lacking.

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Background: Coronavirus disease 19 (COVID-19) is life-threatening infectious disease caused by SARS-CoV-2 virus that caused a global pandemic. SARS-CoV-2 has been widely transmitted throughout Ethiopia, with over 501,060 cases confirmed and 7574 deaths until November 2023. This study assessed for the first time the seroprevalence SARS-CoV-2 in the general population of the Somali Region during the COVID-19 pandemic.

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  • There are significant gaps in diagnosing, treating, and controlling high blood pressure (HBP) in rural areas, particularly in the Peruvian Andes.
  • In a study of 2,752 adults, 18.9% were found to have HBP, with a staggering 72.2% unaware of their condition, and 58.4% of those diagnosed were still uncontrolled.
  • Factors like age, gender, family history of hypertension, and lifestyle choices influenced both the prevalence of HBP and levels of awareness, highlighting the need for better health education and treatment accessibility.
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Introduction: Sustainable livestock production remains crucial for attainment of food security globally and for safeguarding the livelihoods of many households in low- and -middle income countries. However, the high prevalence of infectious livestock diseases, coupled with inadequate provision and adoption of effective control measures, leads to reduced livestock productivity, increased animal mortalities, and emergence of antimicrobial resistant pathogens. This study sought to assess the management strategies employed by farmers for priority diseases affecting their animals and the utilization and performance of veterinary services.

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Background: Infection with the soil-transmitted helminth Strongyloides stercoralis affects up to 600 million people globally, most of whom live in rural areas with poor sanitation. If untreated, infection leads to long-lasting morbidity and might even be life-threatening. Moxidectin might be a promising alternative to ivermectin, the only currently recommended single-dose treatment.

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Introduction: Livestock vaccination coverage rates remain low in many lower and middle income countries despite effective vaccines being commonly available. Consequently, many preventable infectious livestock diseases remain highly prevalent, causing significant animal mortalities and threatening farmers' livelihood and food security. This study sought to assess farmers' maximum willingness to pay (WTP) for contagious bovine pleuropneumonia (CBPP), and peste-des-petits-ruminants (PPR) vaccination of cattle, and sheep and goats, respectively.

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  • * A groundbreaking study in the Middle East utilized whole-genome sequencing to analyze AMR in specific bacteria across humans, animals, and environments, collecting 592 samples in Ramallah/Al-Bireh and Jerusalem between 2021 and 2022.
  • * The research revealed the presence of multidrug-resistant foodborne pathogens in chicken manure, meat, and asymptomatic farm workers, underscoring the urgent need for a One Health approach that integrates human, animal, and environmental health perspectives to combat AMR.
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  • - The study investigated schistosomiasis and hookworm infections in northern Côte d'Ivoire, focusing on a seasonal transmission setting with 742 participants aged 6-96 years.
  • - Results showed a very low prevalence of schistosomiasis (0.3% for S. mansoni and varying levels for S. haematobium) and a hookworm prevalence of 1.5%, with males and younger individuals being more affected.
  • - Malacological surveys identified points of human and animal water contact, and several potential intermediate snail hosts for schistosomes were collected, highlighting areas for future health interventions.
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Introduction: Livestock production is a key livelihood source for many people in developing countries. Poor control of livestock diseases hamper livestock productivity, threatening farmers' wellbeing and food security. This study estimates the effect of livestock mortalities attributable to disease on the wellbeing of livestock farmers.

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Background: Intestinal parasitic infections (IPIs) can cause illness, morbidity, and occasional mortality in children. Agro-pastoralist and pastoralist children in the Somali Regional State of Ethiopia (ESRS) are especially at risk for IPIs, as access to safe water, sanitation, and health services is lacking. Minimal data on the prevalence of IPIs and associated risk factors exists in this region.

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