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Deep transfer learning optimization techniques for medical image classification: a review.
(2022) Kariuki, Paul Wahome; Gikunda,Patrick Kinyua; Wandeto, John mwangi
Medical image classification is a complex and challenging task due to the heterogeneous nature of medical data. Deep transfer learning has emerged as a promising technique for medical image classification, allowing the leveraging of knowledge from pre-trained models learned from large-scale datasets, resulting in improved performance with minimal training and overcoming the disadvantage of small data sets. This paper concisely overviews cutting-edge deep transfer learning optimization approaches for medical image classification. The study covers convolutional neural networks and transfer learning techniques, including relation-based, feature-based, parameter-based, and instance-based transfer learning. Classical classifiers such as Resnet, VGG, Alexnet, Googlenet, and Inception are examined, and their performance on medical image classification tasks is compared. The paper also discusses optimization techniques, such as batch normalization, regularization, and weight initialization, as well as data augmentation and kernel mathematical formulations. The study concludes by identifying challenges when using deep transfer learning for medical image classification and proposing potential future approaches for this field.
Albendazole on Soil Transmitted Nematodes among School Children in Kakamega County, Kenya
(2023-04-18)
Soil-Transmitted Nematodes (STNs) are roundworms transmitted through faecally contaminated soil. Globally, major STNs include Ascaris lumbricoides, Trichuris trichiura and hookworm (Necator americanus and Ancylostoma duodenale). School going children are mostly affected by STN infections. STNs cause malnutrition, intellectual retardation and cognitive deficits. They are distributed worldwide, Kenya included and they are of public health importance. Kenya has embarked on mass deworming programs since 2012.The study is entrenched in school mass deworming programs. Kakamega county has high edemicity of STNs and treatment using albendazole has been going on since 2009. The main objective of the study was to determine the effectiveness of a single 400 milligram dose of albendazole against STNs infections. A longitudinal study was conducted in selected public primary schools selected through random sampling from three randomly selected sub counties, Kakamega East, Kakamega Central and Kakamega South in Kakamega County, in Kenya. A structured checklist was used to establish demographics of the school pupils and schools’ WASH conditions. Kato Katz technique examined STN infections both at baseline and follow up survey. The prevalence of infection was determined as the percentage of children that tested positive for each STNs species to the total number of children examined. Intensity of infection was determined using Arithmetic mean of the number of eggs per gram of feaces. A total of 731 children in baseline from seven primary schools provided stools and were examined for STN infections. A post treatment survey was conducted after two weeks where total of 665 children were examined. Effectiveness of albendazole was analyzed using prevalence reduction and the fecal egg reduction rate (ERR). Data was analyzed using STATA version 12.0. Associations were assessed between WASH predictors and STNs; Infection prevalence of either gender or age group was analysed using Pearson chi-square test. Infection mean intensity was assessed using two sample independent t-test and significance for age group was assessed using ANOVA test. Prevalence of infections based on 95% CIs was calculated using binomial logistic regression. Arithmetic mean expressed mean egg counts and negative binomial regression model estimated mean intensity. At baseline, STNs prevalence was 44.0% (95% CI: 35.8 – 54.2). Common STN was Ascaris lumbricoides. 43.5%. The baseline STN mean intensity was 3674 eggs per gram. There was significant prevalence reduction of combined STN prevalence infection to 2.3% (PR=94.9%, P=0.001). STNs mean intensity was significantly reduced from 3674 epg to 59 epg (ERR=98.4%, P=0.001). Prevalence of T. trichiura significantly reduced, 0.8% to 0 (100%, P<0.001). Pupil latrine ratio was significantly associate with STN infection intensity (X2 = 0.875, df = 1, p=0.350) or intensity (X2 = 0.1944, df = 1, p=0.659). Hand-wash facility with water and soap did not associate with both lower infection prevalence (X2 =0.4667, p=0.495). In this study, mass treatment with Albendazole was highly effective on the STNs. These findings are important to Ministry of Health and Ministry of Education in assessing the national deworming guidelines and policies. Mass Deworming programmes be extended to communities to ensure all possible transmission focal points are covered.
Effectiveness of albendazole on soil transmitted nematodes among school children-: a case of Kakamega County, Kenya
(2019-03-25) Ngonjo, T.W.; Okoyo, Collins; Simiyu, Elses; Kihara, Jimmy; Lelo, Agola Eric; Kabiru, Ephantus; Mwandawiro, Charles
Background: Recent assessment by WHO on Soil Transmitted Nematodes (STN) point that their morbidity is still high in people mainly in children. A. lumbricoides globally infects 1.2 billion people and T. trichiura 795 million worldwide. Infections with Ancylostoma duodenale and Necator americanus 740 million leading to 135,000 deaths per year. It became necessary to find out the effectiveness of Albendazole on soil transmitted Nematodes among school children- a case of kakamega county, kenya.
Methodology: Study respondents were selected fom public primary school children in Kakamega County. A total of 731 and 665 (pre & post) children in 7 primary schools in three sub counties of Kakamega County were recruited in the study.
Pre-treatment survey was done in March, 2014 and follow up in September 2014. Fecal samples were examined for the presence of STN . 14 days after treatment using Kato- Katz method. The total number of eggs were expressed as eggs/gm of feaces (epg). Pretreatment prevalence was 43.5% for Ascaris lumbricoides, 1.8% for hookworm and 0.9% for Trichuris trichiura.
Results: Mean intensity of hookworm, A. lumbricoides and T. trichiura infections in the pre-and post-surveys were reduced by 1.2%, 98.4% and 100% respectively. Prevalence decreased to 2.3% for Ascaris lumbricoides and 0 % for T. trichiura. Post treatment prevalence of A. lumbricoides and T. trichiura infections were significantly reduced by 94.8% and 100% respectively. A slight increase in hookworm prevalence was observed. However, this increase was not significant (p=0.993).
Conclusion: The therapeutic efficacy of Albendazole indicated a good reduction in parasite burden. Albendazole satisfactorily reduced STN infection while for hookworm there was a non-significant increase in prevalence.
Plasmid mediated penicillin and tetracycline resistance among Neisseria gonorrhoeae isolates from Kenya
(2020) Kivata, Mary Wandia; Mbuchi, Margaret; Eyase, Fredrick; Bulimo, Wallace Dimbuson; Kyanya, Cecilia Katunge; Oundo, Valerie; Mbinda, Wilton Mwema; Sang, Willy; Andagalu, Ben; Soge, Olusegun O.; McClelland, Raymond Scott; Distelhorst, John
Background: Treatment of gonorrhea is complicated by the development of antimicrobial resistance in Neisseria gonorrhoeae (GC) to the antibiotics recommended for treatment. Knowledge on types of plasmids and the antibiotic resistance genes they harbor is useful in monitoring the emergence and spread of bacterial antibiotic resistance. In Kenya, studies on gonococcal antimicrobial resistance are few and data on plasmid mediated drug resistance is limited. The present study characterizes plasmid mediated resistance in N. gonorrhoeae isolates recovered from Kenya between 2013 and 2018. Methods: DNA was extracted from 36 sub-cultured GC isolates exhibiting varying drug resistance profiles. Whole genome sequencing was done on Illumina MiSeq platform and reads assembled de-novo using CLC Genomics Workbench. Genome annotation was performed using Rapid Annotation Subsystem Technology. Comparisons in identified antimicrobial resistance determinants were done using Bioedit sequence alignment editor. Results: Twenty-four (66.7%) isolates had both β-lactamase (TEM) and TetM encoding plasmids. 8.3% of the isolates lacked both TEM and TetM plasmids and had intermediate to susceptible penicillin and tetracycline MICs. Twenty-six (72%) isolates harbored TEM encoding plasmids. 25 of the TEM plasmids were of African type while one was an Asian type. Of the 36 isolates, 31 (86.1%) had TetM encoding plasmids, 30 of which harbored American TetM, whereas 1 carried a Dutch TetM. All analyzed isolates had non-mosaic penA alleles. All the isolates expressing TetM were tetracycline resistant (MIC> 1 mg/L) and had increased doxycycline MICs (up to 96 mg/L). All the isolates had S10 ribosomal protein V57M amino acid substitution associated with tetracycline resistance. No relation was observed between PenB and MtrR alterations and penicillin and tetracycline MICs.
ICT Definition Implication on ICT Career Choice and Exclusion among Women
(2016-05) Muchiri, Michael Njoki; Wabwoba, Franklin; Micheni, Elyjoy Muthoni
One of the most noteworthy challenges in society in the 21st century is sustainable development. The usefulness of ICT has led to an overwhelming demand for electronics such as computers and mobile phones. ICT is vital for poverty reduction and in the growth of sectors such as agriculture, business, health, education etc. Applying ICT to drive any development has its advantages and disadvantages. Therefore, its measurement should be focused on whether the benefits outweigh the pitfalls. The purpose of carrying out this research is because most development initiatives in Africa are being undertaken with the use of ICT. Therefore, this paper surveys the literature on ICT for sustainable development without the digital divide and how ICT can lead to un-sustainability in Africa. Findings indicate that driving sustainable development through ICT initiatives bring much greater benefits than negative consequence.