Publications by authors named "Tessema Tesfaye"

Brucellosis is a common zoonotic disease affecting livestock and humans globally. The disease is endemic in Ethiopian livestock. This study was conducted to estimate seropositivity and identify its risk factors in livestock, and practices that may expose pastoralists to the disease.

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Escherichia coli of different pathotypes are frequently involved in morbidity and mortality in animals and humans. The study aimed to identify E. coli pathotypes and determine antimicrobial resistance (AMR) profiles in Ethiopian smallholder livestock households.

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Background: Early detection and treatment of carbapenem-resistant Klebsiella pneumoniae (CRKP) could reduce the risk of developing life-threatening sepsis in childhood. However, little is known about sepsis caused by CRKP in children under-5 in developing countries. This study aimed to determine the epidemiology, antimicrobial resistance profile, associated risk factors and management of CRKP in children under-5 with sepsis in Ethiopia.

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This study aimed to comprehensively examine the prevalence of L. monocytogenes and Listeria spp. in dairy products including raw milk, pasteurized milk, and cottage cheese, and identify potential risk factors for contamination throughout the dairy value chain in major milk sheds in Ethiopia.

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  • The study investigates the potential of lytic bacteriophages as alternative therapies to combat antibiotic-resistant strains of bacteria, particularly focusing on phages that target E. coli.
  • Seven specific phage isolates were identified and analyzed through genome sequencing, revealing they possess double-stranded DNA with varying lengths and coding sequences, with most lacking tRNA genes.
  • The findings suggest that these phages could be utilized in treating bacterial infections and provide essential data for developing phage-based control strategies and understanding phage genetics.
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  • Genomic structural variations, especially copy number variations (CNVs), are important for genetic diversity in cattle, yet they have been underexplored in indigenous Ethiopian breeds like Abigar, Fellata, and Gojjam-Highland.
  • The study identified 3,893 CNV regions covering 19.15 Mb of the cattle genome, with notable differences among breeds, and validated a significant portion of these findings.
  • The analysis revealed candidate genes related to adaptation to high altitudes, heat stress, and tick resistance, highlighting the unique genetic traits of these cattle and their potential implications for breeding and conservation.
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  • * A study conducted from June 2021 to December 2023 involved 5 hospitals and found that 10.8% of 5613 women suspected of sepsis had CRKP infections, with high rates of multi-drug resistance (93.9%) and other varying levels of resistance to critical antibiotics.
  • * Risk factors such as septic abortion, extended hospitalization, and cesarean wound infections were significantly associated with developing sepsis, and treatment often included combining carbapenem with other antibiotics for resistant strains.
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  • * The study detected and characterized four major pathogens responsible for calf diarrhea using fecal samples from both diarrheic and non-diarrheic calves, identifying various strains of Cryptosporidium, rotavirus A, and bovine coronavirus.
  • * Notably, the uncommon G24 genotype of rotavirus A was found for the first time in Ethiopia and Africa, highlighting the need for genetic analysis of these pathogens to improve understanding and control of calf diarrhea.
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The advancement of genetic engineering has revolutionized the field of immunology by allowing the utilization of intrinsic antibody structures. One of the biologics that are being produced by recombinant antibody technology is single-chain fragments variable (scFv). Genes of variable regions, the heavy and light chains that are genetically linked into a single transcript by a short flexible linker peptide, are used to generate this fragment from cellular and synthetic libraries.

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  • Coagulase-negative Staphylococcus species are increasingly being identified as a cause of intramammary infections in dairy cattle, presenting risks to public health and economics, particularly in Northwestern Ethiopia.
  • A study conducted from February to August 2022 isolated these bacteria from 290 milk samples, revealing a prevalence of 28.6% with high resistance to common antibiotics like Amoxicillin and Ampicillin, and notable rates of multidrug resistance.
  • The study also detected several virulence genes in the isolates, suggesting a concerning potential for pathogenicity in these antibiotic-resistant strains.
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  • Seasonal changes impact foodborne illness and microbial contamination in dairy products, although research on this topic in Ethiopia has been limited.
  • This study analyzed the prevalence of contamination in milk and cheese samples across wet and dry seasons in various Ethiopian regions, revealing higher contamination rates during the dry season.
  • Findings suggest that to improve dairy product safety in Ethiopia, ongoing education on hygienic practices for milk production should take seasonal variations into account.
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Introduction: There have been numerous studies that showed the presence of human papillomavirus (HPV) in breast cancer; nonetheless, there is ongoing debate regarding their association. Given few studies in Ethiopia, we aimed to investigate the magnitude of HPV infection in Ethiopian breast cancer patients.

Methods: A total of 120 formalin-fixed paraffin-embedded (FFPE) tissue blocks were obtained, and basic demographic, clinical, and histological data were collected from medical records.

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Background: Escherichia coli is a common fecal coliform, facultative aerobic, gram-negative bacterium. Pathogenic strains of such microbes have evolved to cause diarrhea, urinary tract infections, and septicemias. The emergence of antibiotic resistance urged the identification of an alternative strategy.

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  • * Researchers examined 15 L. monocytogenes and 55 L. innocua samples from various dairy supply chains in Ethiopia using whole-genome sequencing to understand their genetic diversity and relationships.
  • * The study identified 3 L. monocytogenes and 12 L. innocua sequence types, finding both region-specific and widespread strains, with low genetic variation among L. monocytogenes indicating possible selection pressures in the dairy supply chain.
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  • The study examines breast cancer (BC) subtypes across four Ethiopian regions, highlighting a lack of research in areas outside Addis Ababa.
  • Researchers analyzed 227 tissue samples using immunohistochemistry to determine the presence of key markers and found high rates of ER and PR negativity, as well as a significant prevalence of triple-negative breast cancer (TNBC) at 33.1%.
  • The findings indicate that a substantial proportion of patients may not benefit from standard endocrine treatments, and the high occurrence of aggressive tumors in younger patients suggests a need for tailored treatment approaches.
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Introduction: Matrix metalloproteinases (MMPs) play a pathophysiological role in cancer initiation and progression. Numerous studies have examined an association between MMP-2, MMP-9, and MMP-11 expression and clinicopathological characteristics of breast cancer (BC); however, no research has been done on the MMP expression levels in BC cases from Ethiopia.

Materials And Methods: A total of 58 formalin-fixed paraffin-embedded breast tissue samples encompassing 16 benign breast tumors and 42 BC were collected.

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Purpose: This study aimed at evaluating the performance of the Loop Mediated Isothermal Amplification (LAMP) diagnostic test, which targets the putative Fimbria protein-encoding gene (Z3276) for rapid and specific detection of locally isolated enterohemorrhagic (EHEC) O157:H7.

Results: A total number of 40 locally available bacteria isolates and standard strains, among them 6 (O157:H7) and 10 entropathogenic , 7 non diarrheic strains and 13 non entrohemorrhagic shiga toxic (stx) isolates as well as 4 pathogenic non species were used to optimize and evaluate the LAMP assay. The LAMP amplified DNA samples were visualized as turbid DNA both by naked eye and gel electrophoresis followed by staining.

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This paper reports an evaluation of eleven oat genotypes in four environments for two consecutive years to identify high-biomass-yielding, stable, and broadly adapted genotypes in selected parts of Ethiopia. Genotypes were planted and evaluated with a randomized complete block design, which was repeated three times. The additive main effect and multiplicative interaction analysis of variances revealed that the environment, genotype, and genotype-environment interaction had a significant ( ≤ 0.

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  • The study focused on bloodstream infections caused by beta-lactamase and carbapenemase-producing gram-negative bacteria at a tertiary care hospital in Addis Ababa, Ethiopia, aiming to evaluate their prevalence and risk factors.
  • A cross-sectional study was conducted from September 2018 to March 2019, analyzing blood cultures from 1486 patients suspected of having bloodstream infections and using various laboratory tests to identify resistant bacteria.
  • Results showed that out of 231 identified gram-negative bacteria, 84.4% produced drug-hydrolyzing enzymes, highlighting a significant challenge in treating these infections due to widespread antibiotic resistance.
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  • The study investigates breast cancer (BC) incidence in southern and southwestern Ethiopia, highlighting a lack of accurate epidemiological data.
  • It analyzed biopsy reports from 2015 to 2019, finding the average patient age at diagnosis to be 42.27 years, with most cases diagnosed at stage III and larger tumor sizes.
  • The results indicate that invasive ductal carcinoma is the most prevalent type of BC, and lymph node involvement is significant in relation to tumor size and surgical type.
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Background: Ethiopia rolled out primaquine nationwide in 2018 for radical cure along with chloroquine for the treatment of uncomplicated Plasmodium vivax malaria in its bid for malaria elimination by 2030. The emergence of anti-malarial drug resistance would challenge the elimination goal. There is limited evidence on the emergence of chloroquine drug resistance.

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Background: In Ethiopia, livestock contributes 45% of agricultural GDP. Despite the economic role played by the sector, there have been little efforts to genetically improve the indigenous cattle. Morphological characterization of selected Ethiopian indigenous cattle has been made for (Bonga, Jimma, and Kerayu) cattle types.

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Different pathotypes are common zoonotic agents. Some of these pathotypes cause recurrent and widespread calf diarrhea and contribute to significant economic losses in the livestock sector worldwide in addition to putting humans at risk. Here, we investigated the occurrence of pathotypes in diarrheic calves in Ethiopia kept under various calf management practices.

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A cross-sectional study was conducted to investigate the prevalence and risk factors for contamination of Ethiopian dairy products with Campylobacter. A total of 912 dairy food samples were collected from establishments of 682 study participants that were interviewed. Samples were tested for Campylobacter by following the ISO 10272-1:2017 standard and PCR confirmation.

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Brucellosis is a zoonotic disease of considerable economic and public health significance globally. Despite the limited bacteriological evidence, a large number of serological works revealed that it is prevalent both in livestock and humans in Ethiopia. The current comprehensive review was carried out to provide apparent pooled seroprevalence (APS) estimates at individual animal and herd levels in livestock, and identify factors causing variability between studies conducted over the last two decades, show the spatial distribution, as well as summarizes Brucella species reported from livestock.

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