Raphael Z. Sangeda

Dr. Raphael Z. Sangeda

Department of Pharmaceutical Microbiology, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
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Research Focus & Metrics

Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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4 October 2014 in BMC Public Health
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Journal Article
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Raphael Z. SangedaRaphael Z. Sangeda
Raphael Z. Sangeda
FMFausta Mosha
Fausta Mosha
MPMattia Prosperi
Mattia Prosperi
SASaid Aboud
Said Aboud
JVJurgen Vercauteren
Jurgen Vercauteren
AVAnne-Mieke Vandamme
Anne-Mieke Vandamme
Optimal adherence to antiretroviral therapy is critical to prevent HIV drug resistance (HIVDR) epidemic. The objective of the study was to investigate the best performing adherence assessment method for predicting virological failure in resource-limited settings (RLS). This study was a single-centre prospective cohort, enrolling 220 HIV-infected adult patients attending an HIV/AIDS Care and Treatment Centre in Dar es Salaam, Tanzania, in 2010. Pharmacy refill, self-report (via visual analog scale [VAS] and the Swiss HIV Cohort study-adherence questionnaire), pill count, and appointment keeping adherence measurements were taken. Univariate logistic regression (LR) was done to explore a cut-off that gives a better trade-off between sensitivity and specificity, and a higher area under the curve (AUC) based on receiver operating characteristic curve in predicting virological failure. Additionally, the adherence models were evaluated by fitting multivariate LR with stepwise functions, decision trees, and random forests models, assessing 10-fold multiple cross validation (MCV). Patient factors associated with virological failure were determined using LR. Viral load measurements at baseline and one year after recruitment were available for 162 patients, of whom 55 (34%) had detectable viral load and 17 (10.5%) had immunological failure at one year after recruitment. The optimal cut-off points significantly predictive of virological failure were 95%, 80%, 95% and 90% for VAS, appointment keeping, pharmacy refill, and pill count adherence respectively. The AUC for these methods ranged from 0.52 to 0.61, with pharmacy refill giving the best performance at AUC 0.61. Multivariate logistic regression with boost stepwise MCV had higher AUC (0.64) compared to all univariate adherence models, except pharmacy refill adherence univariate model, which was comparable to the multivariate model (AUC = 0.64). Decision trees and random forests models were inferior to boost stepwise model. Pharmacy refill adherence (<95%) emerged as the best method for predicting virological failure. Other significant predictors in multivariate LR were having a baseline CD4 T lymphocytes count < 200 cells/μl, being unable to recall the diagnosis date, and a higher weight. Pharmacy refill has the potential to predict virological failure and to identify patients to be considered for viral load monitoring and HIVDR testing in RLS.

5 October 2023 in BMC Infectious Diseases
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EMEulambius Mlugu
Eulambius Mlugu
JMJuma A. Mohamedi
Juma A. Mohamedi
Raphael Z. SangedaRaphael Z. Sangeda
Raphael Z. Sangeda
KMKennedy D. Mwambete
Kennedy D. Mwambete
Introduction: Urinary tract infection (UTI) is the second most common infectious disease affecting more than 150 million people globally annually. UropathogenicE. coli(UPEC), the predominant cause of UTI, can occur as a biofilm associated with antimicrobial resistance (AMR). There is a data gap on global AMR patterns from low-income settings, including Tanzania. Data on antimicrobial susceptibility patterns in relation to biofilm formation will help in the proper selection of antibiotics and the fight against AMR.Methods: This analytical cross-sectional study was conducted among consecutively selected outpatients (n = 344) from January to May 2022 at Morogoro Regional Referal Hospital. Mid-stream urine samples were collected aseptically from symptomatic patients. A significant UTI was defined when more than 105colonies/ml of urine were recorded. Kirby Bauer’s disc diffusion method was used for antibiotics susceptibility patterns and a Congo Red Agar method was used to determine biofilm formation. Two-sided χ2 test or Fisher’s exact test, Cohen’s kappa coefficient and logistic regression were used for data analysis. A p-value < 0.05 was considered statistically significant.Results: The prevalence of UTIs was 41% (141/344) and elders (>=60 years) had five times higher odds of having UTI as compared to adolescents (p < 0.001).E. coliwas the most predominant bacteria (47%; 66/141), which displayed moderate susceptibility against ciprofloxacin (59.1%) and nitrofurantoin (57.6%). A total of 72 (51%) of all isolated bacteria were multi-drug resistant. All isolated bacteria demonstrated high resistance (> 85%) against ampicillin and co-trimoxazole. In this study, 51.5% (34/66) were biofilm-formingE. coliand demonstrated relatively higher antibiotic resistance as compared to non-biofilm forming bacteria (p < 0.05).Conclusion: We report high antibiotic resistance against commonly used antibiotics. Slightly more than half of the isolated bacteria were biofilm formingE. coli.A need to strengthen stewardship programs is urgently advocated.

15 January 2013 in BMC Public Health
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FMFausta Mosha
Fausta Mosha
VMVictor Muchunguzi
Victor Muchunguzi
MMMecey Matee
Mecey Matee
Raphael Z. SangedaRaphael Z. Sangeda
Raphael Z. Sangeda
JVJurgen Vercauteren
Jurgen Vercauteren
AVAnne-Mieke Vandamme
Anne-Mieke Vandamme
We investigated gender differences in treatment outcome during first line antiretroviral treatment (ART) in a hospital setting in Tanzania, assessing clinical, social demographic, virological and immunological factors.

5 October 2018 in The Electronic Journal of Information Systems in Developing Countries
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ELEdda Lwoga
Edda Lwoga
Raphael Z. SangedaRaphael Z. Sangeda
Raphael Z. Sangeda
This systematic review of reviews aimed to explore the contribution of information and communication technologies (ICTs) for development in developing countries. This systematic review of reviews determines and summarizes ICTD research trends, and methodologies and conceptual frameworks used in ICTD research discuss the findings and evidence and then suggest approaches for further research. We reviewed existing systematic reviews published on ICT and development between January 1990 and July 2017. The review of reviews shows that a growing number of ICTD research works have used qualitative research approaches for data collection and analysis. We note several attempts to develop and apply models/frameworks over explanatory and predictive theories, most notably in the area of social, sociotechnical, and technical. Nevertheless, there is limited evidence on the long‐term contribution of ICT use on livelihoods, patterns of economic inequality, human freedom, and well‐being in developing countries. This review of reviews synthesizes existing systematic reviews on the contribution of ICT for development than was previously available for developing countries. This review has the potential for several stakeholders, including the public and private sector, intermediaries, and nonprofit organizations, to utilize the accumulated evidence from selected systematic reviews to enable/improve the appropriate and sustainable use of ICTs for development.

27 August 2020 in Frontiers in Public Health
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Raphael Z. SangedaRaphael Z. Sangeda
Raphael Z. Sangeda
JKJoel Kibona
Joel Kibona
CMCastory Munishi
Castory Munishi
FAFrank Arabi
Frank Arabi
VMVicky P. Manyanga
Vicky P. Manyanga
PHPius G. Horumpende
Pius G. Horumpende
Introduction: Antimicrobial resistance (AMR) is a current global health threat and a challenge to the treatment of infectious diseases. The WHO advocates a strategy of antibiotic stewardship programs (ASP) in optimizing antimicrobial use in hospitals. This study aimed at assessing the existence of AMR surveillance and ASP implementation in health facilities in Tanzania in the year following the launch of the National Action Plan (NAP). Methodology: From December 2017 through July 2018, a descriptive cross-sectional study was conducted using a structured questionnaire administered online. A total of 199 health facilities in Tanzania mainland whose contacts was obtained from the Ministry of Health Community Development Gender Elderly and Children (MoHCDGEC) were reached by phone and thereafter, a survey was sent via text or e-mail to focal persons in the corresponding facilities. Results: Only 39 (32.5%) responses from contacted facilities were received and analyzed. Thirty (76.9%) of the facilities were government-owned. Of the 39 respondents surveyed, 13 (35.9%) declared to have implemented some sort of coordinated ASP to promote the rational use of antimicrobials at their facilities. The respondents reported the presence of guidelines for the implementation of ASP at variable proportions, whereas the presence of a committee for Infection Prevention and Control was reported by 27 (69.2%). Twenty-four (61.5%) had a Medical and Therapeutic Committee. Although all 39 (100%) respondents were aware of the presence of AMR in Tanzania, only 26 (66.7%) were aware of the presence of the Tanzanian NAP for AMR. Hospital antibiotic policy document was present in 6 (15.4%) facilities. Only 7 (17.9%) facilities conducted prescription auditing; 9 (23.1%) had a hospital formulary; 14 (35.9%) had standard hospital prescription. 9 (23.1%) had software for data storage about AMR. Only 7 (17.9%) facilities conducted microorganisms' susceptibility tests and kept the record of the microorganism susceptibility testing. Conclusion: Our study found the existence of AMR surveillance activities and ASP implementation in Tanzania, albeit at a low level. The implementation was inconsistent across the surveyed facilities. These data have identified areas of improvement in addressing AMR in Tanzania through the NAP.

14 November 2018 in BMC Hematology
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JMJulie Makani
Julie Makani
FTFurahini Tluway
Furahini Tluway
AMAbel Makubi
Abel Makubi
DSDeogratius Soka
Deogratius Soka
SNSiana Nkya
Siana Nkya
BMBruno Mmbando
Bruno Mmbando
Africa has the highest burden of Sickle cell disease (SCD) but there are few large, systematic studies providing reliable descriptions of the disease spectrum. Tanzania, with 11,000 SCD births annually, established the Muhimbili Sickle Cell program aiming to improve understanding of SCD in Africa. We report the profile of SCD seen in the first 10 years at Muhimbili National Hospital (MNH). Individuals seen at MNH known or suspected to have SCD were enrolled at clinic and laboratory testing for SCD, haematological and biochemical analyses done. Ethnicity was self-reported. Clinical and laboratory features of SCD were documented. Comparison was made with non-SCD population as well as within 3 different age groups (< 5, 5–17 and ≥ 18 years) within the SCD population. From 2004 to 2013, 6397 individuals, 3751 (58.6%) SCD patients, were enrolled, the majority (47.4%) in age group 5–17 years. There was variation in the geographical distribution of SCD. Individuals with SCD compared to non-SCD, had significantly lower blood pressure and peripheral oxygen saturation (SpO2). SCD patients had higher prevalence of severe anemia, jaundice and desaturation (SpO2 < 95%) as well as higher levels of reticulocytes, white blood cells, platelets and fetal hemoglobin. The main causes of hospitalization for SCD within a 12-month period preceding enrolment were pain (adults), and fever and severe anemia (children). When clinical and laboratory features were compared in SCD within 3 age groups, there was a progressive decrease in the prevalence of splenic enlargement and an increase in prevalence of jaundice. Furthermore, there were significant differences with monotonic trends across age groups in SpO2, hematological and biochemical parameters. This report confirms that the wide spectrum of clinical expression of SCD observed elsewhere is also present in Tanzania, with non-uniform geographical distribution across the country. Age-specific analysis is consistent with different disease-patterns across the lifespan.