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1.
PLoS One ; 18(7): e0288444, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37440482

RESUMEN

INTRODUCTION: Discharge of excreta to the environment lead to surface and groundwater contamination and human exposure to disease-causing micro-organisms. There is limitation of evidences regarding the latrine utilization among community-led total sanitation and hygiene implemented and non-implemented districts of the East Wollega Zone. Hence, this study aimed to determine the magnitude and associated factors of latrine utilization among households in community-led total sanitation and hygiene implemented and non-implemented Districts in East Wollega Zone, Western Ethiopia. METHODS: A cross-sectional study was conducted. A Multi-stage sampling technique was applied to select the 461 households. Data were collected using interviews and observations guided by a pre-structured questionnaire. Data were entered using Epi Data and exported to SPSS software version 25 for data recording, cleaning, and statistical analysis. Bivariable logistic regression was run to identify the candidate variables at p-value <0.25. Variables that had associations with latrine utilization in the bi-variable analysis were entered together into multivariable logistic regression. An Adjusted odds ratio with a 95% confidence interval was calculated and P-value< 0.05 was used to declare a statistically significant association. RESULT: The overall prevalence of latrine utilization was found to be 52.7% (95%CI:48%, 57.3%). Religion (AOR = 0.149;95%CI:0.044,0.506), education (AOR = 3.861;95%CI:1.642,9.077), occupation, absence of children <5 years (AOR = 4.724;95%CI:2.313,9.648), toilet cleaning (AOR = 10.662;95%CI:5.571,20.403), frequency of latrine construction (AOR = 6.441;95%CI:2.203,18.826), maintenance need (AOR = 6.446; 95%CI:3.023,13.744), distance from health institution (AOR = 0.987; 95%CI:0.978, 0.996), distance from kebele office (AOR = 6.478; 95%CI:2.137,19.635), and latrine distance from dwelling (AOR = 11.656; 95%CI:2.108, 64.44) were the factors associated with latrine use. CONCLUSION: The latrine utilization in this study is low as compared to other studies. Religion, education, occupation, absence of children <5 years, toilet cleaning, frequency of latrine construction, maintenance need of the toilet, distance from health institution, distance from kebele, and latrine distance from dwelling are the associated factors of latrine utilization. Both households and health workers have to work together to improve latrine utilization and the safe disposal of children's feces.


Asunto(s)
Saneamiento , Cuartos de Baño , Niño , Humanos , Saneamiento/métodos , Estudios Transversales , Etiopía/epidemiología , Población Rural , Higiene
2.
Emerg Infect Dis ; 29(3): 609-613, 2023 03.
Artículo en Inglés | MEDLINE | ID: mdl-36823496

RESUMEN

During October 2016-March 2022, Uganda increased tuberculosis (TB) preventive therapy coverage among persons living with HIV from 0.6% to 88.8%. TB notification rates increased from 881.1 to 972.5 per 100,000 persons living with HIV. Timely TB screening, diagnosis, and earlier treatment should remain high priorities for TB/HIV prevention programming.


Asunto(s)
Síndrome de Inmunodeficiencia Adquirida , Infecciones por VIH , Tuberculosis , Humanos , Tuberculosis/diagnóstico , Uganda , Tamizaje Masivo , Infecciones por VIH/prevención & control
3.
PLoS One ; 17(12): e0278851, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36548246

RESUMEN

BACKGROUND: The World Health Organization (WHO) recommends systematic and active investigation of TB contacts. However, lower priority is given to contact investigation among other non-pulmonary bacteriologically confirmed (PBC) cases; it thus contributes to the scarce information on the yield of TB among contacts of index TB patients without microbiological confirmation (non-PBC patients). This study therefore aimed at establishing the yield of TB among contacts of PBC and non-PBC index TB patients in the urban setting of central Uganda. METHODS: We abstracted data from the Uganda national TB contact investigation registers present at 48 health facilities for the period January 2018 to August 2020. The screening yield for both PBC and non-PBC, timing of TB diagnosis among contacts were determined. Logistic regression was used to examine predictors for diagnosing contacts as non PBC TB patients. RESULTS: From January 2018 to August 2020, 234 persons were diagnosed with TB from a total of 14,275 contacts traced for both PBC and non-PBC TB index patients at 48 facilities. Of these, 100(42.7%) were contacts of non-PBC index patients. TB screening yield was higher among contacts of non PBC 100(2.0%) compared to 134(1.4%) among contacts of PBC index patients. For both groups, over 80% of their contacts were diagnosed with TB within 3 months from the day of TB treatment start of the index case. On multivariate logistic regression the only predictor for diagnosing contacts as non PBC TB patients was age under15 years (adjusted odds ratio [aOR] 7.53, 95% CI [3.27-17.3] p = <0.05). CONCLUSION: The yield of TB among contacts of non-PBC index case is nearly the same for contacts of PBC index cases and most contacts were diagnosed with TB disease during the intensive TB treatment phase of the index case. There was no association between the type of TB (PBC, non-PBC) disease diagnosed in the contacts, and that of index TB patients. To improve TB case-finding, emphasis should be placed on contact investigation for household and close contacts of all other index cases with pulmonary tuberculosis regardless of whether PBC or non-PBC during the intensive phase of treatment.


Asunto(s)
Tuberculosis Pulmonar , Tuberculosis , Humanos , Adolescente , Uganda/epidemiología , Tuberculosis/diagnóstico , Tuberculosis/epidemiología , Tuberculosis/complicaciones , Tuberculosis Pulmonar/diagnóstico , Tuberculosis Pulmonar/epidemiología , Tuberculosis Pulmonar/complicaciones , Trazado de Contacto , Composición Familiar
4.
J Blood Med ; 13: 711-724, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36452275

RESUMEN

Introduction: Blood donation is the process of collecting blood from donors who are at low risk for infection and unlikely to jeopardize their own health. Blood donation addresses maternal and child mortality and contributes to saving millions of lives. But many African countries including Ethiopia are far below the minimum blood collection rate. Furthermore, the blood donation practice is not well studied among young university students in the study area. Hence, this study was done to assess the blood donation practice and associated factors among Wollega University students, Ethiopia. Methods: A cross-sectional study was conducted among 387 students of Wollega University. The students were selected by systematic random sampling. Self-administered questionnaire was used to collect the data. The data were entered into Epidata V.3.1 and exported to SPSSV.25 for analysis. Both bivariate and multivariate logistic regressions were used to identify the associated factors. Adjusted odds ratio with 95% confidence interval and P-value <0.05 were used to declare the statistically significant associations in the multivariable regression. The analyzed result was presented using tables, graphs, and text. Results: Of the 360 respondents, 147 (40.8%; 95% CI: 35.7-46.1%) ever donated blood. Blood donation practice was significantly associated with college of the students (AOR = 3.247; 95% CI: 1.348-7.820), not taking part in blood donation campaigns (AOR = 0.285; 95% CI: 0.161-0.503), knowledge of blood bank location (AOR = 5.297; 95% CI: 3.081-9.110), knowledge about blood donation (AOR = 2.035; 95% CI: 1.123-3.686) and attitude toward blood donation (AOR = 2.266; 95% CI: 1.122-4.577). Conclusion: The magnitude of blood donation in this study was found to be less than the recommended level by the World Health Organization. Absence of the blood donation campaigns, college of study, lack of knowledge, and poor attitude toward blood donation were the factors that influence the blood donation practice. All health and related institutions including the Wollega University must work in coordination to improve the blood donation practice focusing on the regular voluntary blood donors.

5.
BMC Health Serv Res ; 22(1): 1315, 2022 Nov 03.
Artículo en Inglés | MEDLINE | ID: mdl-36329450

RESUMEN

This cost-outcome study estimated, from the perspective of the service provider, the total annual cost per client on antiretroviral therapy (ART) and total annual cost per client virally suppressed (defined as < 1000 copies/ml at the time of the study) in Uganda in five ART differentiated service delivery models (DSDMs). These included both facility- and community-based models and the standard of care (SOC), known as the facility-based individual management (FBIM) model. The Ministry of Health (MOH) adopted guidelines for DSDMs in 2017 and sought to measure their costs and outcomes, in order to effectively plan for their resourcing, implementation, and scale-up. In Uganda, the standard of care (FBIM) is considered as a DSDM option for clients requiring specialized treatment and support, or for those who select not to join an alternative DSDM. Note that clients on second-line regimes and considered as "established on treatment" can join a suitable DSDM.Using retrospective client record review of a cohort of clients over a two-year period, with bottom-up collection of clients' resource utilization data, top-down collection of above-delivery level and delivery-level providers' fixed operational costs, and local unit costs. Forty-seven DSDMs located at facilities or community-based points in the four regions of Uganda were included in the study, with 653 adults on ART (> 18 years old) enrolled in a DSDM. The study found that retention in care was 98% for the sample as a whole [96-100%], and viral suppression, 91% [86-93%]. The mean cost to the provider (MOH or NGO implementers) was $152 per annum per client treated, ranging from $141 to $166. Differences among the models' costs were largely due to clients' ARV regimens and the proportions of clients on second line regimens. Service delivery costs, excluding ARVs, other medicines and laboratory tests, were modest, ranging from $9.66-16.43 per client per year. We conclude that differentiated ART service delivery in Uganda achieved excellent treatment outcomes at a cost similar to the standard of care. While large budgetary savings might not be immediately realized, the reallocation of "saved" staff time could improve health system efficiency and with their equivalent or better outcomes and large benefits to clients, client-centred differentiated models would nevertheless add great societal value.


Asunto(s)
Fármacos Anti-VIH , Infecciones por VIH , Adulto , Humanos , Adolescente , Uganda , Estudios Retrospectivos , Infecciones por VIH/tratamiento farmacológico , Programas de Gobierno , Fármacos Anti-VIH/uso terapéutico
6.
BMC Infect Dis ; 21(1): 292, 2021 Mar 22.
Artículo en Inglés | MEDLINE | ID: mdl-33752637

RESUMEN

BACKGROUND: The World Health Organization (WHO) End TB strategy aims to reduce mortality due to tuberculosis (TB) to less than 5% by 2035. However, mortality due to multidrug-resistant tuberculosis (MDR-TB) remains particularly high. Globally, almost 20% of patients started on MDR-TB treatment die during the course of treatment every year. We set out to examine the risk factors for mortality among a cohort of patients diagnosed with MDR-TB in Uganda. METHODS: We conducted a case-control study nested within the national MDR-TB cohort. We defined cases as patients who died from any cause during the course of MDR-TB treatment. We selected two controls for each case from patients alive and on MDR-TB treatment at the time that the death occurred (incidence-density sampling). We matched the cases and controls on health facility at which they were receiving care. We performed conditional logistic regression to identify the risk factors for mortality. RESULTS: Data from 198 patients (66 cases and 132 controls) started on MDR-TB treatment from January 1 to December 31, 2016, was analyzed for this study. Cases were similar to controls in age/sex distribution, occupation and history of TB treatment. However, cases were more likely to be HIV infected while controls were more likely to have attained secondary level education. On multivariate regression analysis, co-infection with HIV (aOR 1.9, 95% CI [1.1-4.92] p = 0.05); non-adherence to MDR-TB treatment (aOR 1.92, 95% CI [1.02-4.83] p = 0.04); age over 50 years (aOR 3.04, 95% CI [1.13-8.20] p = 0.03); and having no education (aOR 3.61, 95% CI [1.1-10.4] p = 0.03) were associated with MDR-TB mortality. CONCLUSION: To mitigate MDR-TB mortality, attention must be paid to provision of social support particularly for older persons on MDR-TB treatment. In addition, interventions that support treatment adherence and promote early detection and management of TB among HIV infected persons should also be emphasized.


Asunto(s)
Tuberculosis Resistente a Múltiples Medicamentos/diagnóstico , Adolescente , Adulto , Antituberculosos/uso terapéutico , Estudios de Casos y Controles , Niño , Preescolar , Coinfección/diagnóstico , Escolaridad , Femenino , Infecciones por VIH/complicaciones , Infecciones por VIH/diagnóstico , Humanos , Lactante , Recién Nacido , Masculino , Cumplimiento de la Medicación , Persona de Mediana Edad , Oportunidad Relativa , Factores de Riesgo , Análisis de Supervivencia , Tuberculosis Resistente a Múltiples Medicamentos/tratamiento farmacológico , Tuberculosis Resistente a Múltiples Medicamentos/epidemiología , Tuberculosis Resistente a Múltiples Medicamentos/mortalidad , Uganda/epidemiología , Adulto Joven
7.
Afr Health Sci ; 21(3): 975-984, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-35222557

RESUMEN

INTRODUCTION: Systematic screening for TB among patients presenting to care and among high risk populations is recommended to improve TB case finding. We aimed to describe the comparative yield of three TB screening approaches implemented by a large urban TB project in central Uganda. METHODS: We abstracted data on the screening cascade from 65 health facilities and their surrounding communities (numbers screened, with presumptive TB, receiving a diagnostic test and diagnosed with TB) from the different clinic and community TB registers. RESULTS: From January 2018 to December 2019, 93,378 (24%) of all patients screened at health facilities had presumptive TB; 77,381 (82.9%) received a diagnostic test and 14,305 (18.5%) were diagnosed with TB. The screening yield (the number of patients diagnosed with TB out of all patients screened) was 0.3% and was three times higher among men than women (0.6% vs 0.2% p<0.01). During targeted community screening interventions, 9874 (21.1%) of all patients screened had presumptive TB; 7034 (71.2%) of these received a diagnostic test and 1699 (24.2%) were diagnosed with TB. The screening yield was higher among men, (3.7% vs 3.3% p<0.01) and highest among children 0-14 (4.8% vs 3.2% p<0.01). CONCLUSION: Targeted community TB screening interventions improve access to TB diagnosis for men and children 0-14 years.


Asunto(s)
Tuberculosis , Niño , Atención a la Salud , Femenino , Instituciones de Salud , Humanos , Masculino , Tamizaje Masivo , Tuberculosis/diagnóstico , Tuberculosis/epidemiología , Tuberculosis/prevención & control , Uganda/epidemiología
8.
Afr. health sci. ; 21(3): 975-984, 2021.
Artículo en Inglés | AIM (África) | ID: biblio-1342653

RESUMEN

Introduction: Systematic screening for TB among patients presenting to care and among high risk populations is recom- mended to improve TB case finding. We aimed to describe the comparative yield of three TB screening approaches imple- mented by a large urban TB project in central Uganda. Methods: We abstracted data on the screening cascade from 65 health facilities and their surrounding communities (num- bers screened, with presumptive TB, receiving a diagnostic test and diagnosed with TB) from the different clinic and com- munity TB registers. Results: From January 2018 to December 2019, 93,378 (24%) of all patients screened at health facilities had presumptive TB; 77,381 (82.9%) received a diagnostic test and 14,305 (18.5%) were diagnosed with TB. The screening yield (the number of patients diagnosed with TB out of all patients screened) was 0.3% and was three times higher among men than women (0.6% vs 0.2% p<0.01). During targeted community screening interventions, 9874 (21.1%) of all patients screened had presumptive TB; 7034 (71.2%) of these received a diagnostic test and 1699 (24.2%) were diagnosed with TB. The screening yield was higher among men, (3.7% vs 3.3% p<0.01) and highest among children 0-14 (4.8% vs 3.2% p<0.01). Conclusion: Targeted community TB screening interventions improve access to TB diagnosis for men and children 0-14 years


Asunto(s)
Humanos , Tuberculosis , Características de la Residencia , Uganda , Tamizaje Masivo
9.
BMC Public Health ; 20(1): 1409, 2020 Sep 16.
Artículo en Inglés | MEDLINE | ID: mdl-32938411

RESUMEN

BACKGROUND: Tuberculosis (TB) patients in Uganda incur large costs related to the illness, and while seeking and receiving health care. Such costs create access and adherence barriers which affect health outcomes and increase transmission of disease. The study ascertained the proportion of Ugandan TB affected households incurring catastrophic costs and the main cost drivers. METHODS: A cross-sectional survey with retrospective data collection and projections was conducted in 2017. A total of 1178 drug resistant (DR) TB (44) and drug sensitive (DS) TB patients (1134), 2 weeks into intensive or continuation phase of treatment were consecutively enrolled across 67 randomly selected TB treatment facilities. RESULTS: Of the 1178 respondents, 62.7% were male, 44.7% were aged 15-34 years and 55.5% were HIV positive. For each TB episode, patients on average incurred costs of USD 396 for a DS-TB episode and USD 3722 for a Multi drug resistant tuberculosis (MDR TB) episode. Up to 48.5% of households borrowed, used savings or sold assets to defray these costs. More than half (53.1%) of TB affected households experienced TB-related costs above 20% of their annual household expenditure, with the main cost drivers being non-medical expenditure such as travel, nutritional supplements and food. CONCLUSION: Despite free health care in public health facilities, over half of Ugandan TB affected households experience catastrophic costs. Roll out of social protection interventions like TB assistance programs, insurance schemes, and enforcement of legislation related to social protection through multi-sectoral action plans with central NTP involvement would palliate these costs.


Asunto(s)
Tuberculosis Resistente a Múltiples Medicamentos , Tuberculosis , Adolescente , Adulto , Costo de Enfermedad , Estudios Transversales , Femenino , Costos de la Atención en Salud , Humanos , Masculino , Estudios Retrospectivos , Tuberculosis/tratamiento farmacológico , Tuberculosis/epidemiología , Uganda/epidemiología , Adulto Joven
10.
PLoS One ; 14(10): e0221513, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31596859

RESUMEN

BACKGROUND: Neonatal mortality is a significant contributor to infant mortality. Causes and predictors of neonatal death are known to vary in different settings and across different contexts. This study aimed to assess predictors, causes, and trends of neonatal mortality amongst neonates admitted to Nekemte Referral Hospital neonatal unit between 2010-2014. METHODS: Retrospective data was collected for 2090 live born neonates admitted to the neonatal intensive care unit of Nekemte Referral Hospital by reviewing records between 2010 to 2014. Variables were collected from the neonatal registration book and patient card on the predictors, causes, and trends of neonatal death using a standard checklist developed by the World Health Organization (WHO). Data was analyzed using Epi info version 3.5.1, and SPSS version 25 for windows. The level of significance was set at P<0.05 with the corresponding confidence intervals at 95%. A logistic regression model was used for analysis and to control for confounders. Microsoft Excel 2007 was used to construct the trend analysis. RESULTS: There were 183 deaths in the cohort equivalent to 8.8% of deaths among total admitted neonates during the study period. Early neonatal deaths accounted for 8% and late neonatal deaths accounted for 0.71% of deaths among total admitted neonates. Main predictors identified for an increased risk of neonatal mortality were; neonates from rural residents [AOR 1.35, (95% CI, 1.35-1.87)], birth order of greater than five [AOR 5.10, (95% CI, 1.15-22.63)], home delivery [AOR 3.41, (95% CI, 2.24-5.19)], very low birth weight [AOR 6.75, (95% CI, 3.63-12.54)] and low birth weight [AOR 2.81, (95% CI, 1.95-4.05)] and inability to cry at birth [AOR 2.21, (95% CI, 1.51-3.22)]. The trend analysis showed a sharp fall for the neonatal mortality over the last five years with a mean reduction of 16%. CONCLUSIONS: Data from the Nekemte Referral Hospital Neonatal Intensive Care Unit analysis revealed majority of the deaths were occurred during early neonatal period. The main predictors of neonatal mortality identified from this study needs strengthening an appropriate public health intervention through addressing antenatal care, curbing home delivery.


Asunto(s)
Mortalidad Infantil , Unidades de Cuidado Intensivo Neonatal , Modelos Biológicos , Derivación y Consulta , Etiopía/epidemiología , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Estudios Retrospectivos , Factores de Riesgo
11.
PLoS One ; 13(12): e0208390, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30566486

RESUMEN

While old age is a known risk factor for developing active tuberculosis (TB), studies on TB in the population aged 60 years and older (considered elderly in this study) are few, especially in the developing world. Results of the TB prevalence survey in Uganda found high TB prevalence (570/100,000) in people over 65. We focused on treatment outcomes in the elderly to understand this epidemic better. We conducted a retrospective analysis of data from TB facility registers in Kampala City for the period 2014-2015. We analyzed the 2014-15 cohort with respect to age, sex, disease class, patients' human immunodeficiency virus (HIV) and directly observed therapy (DOT) status, type of facility, and treatment outcomes and compared findings in the elderly (≥60) and younger (<60) age groups. Of 15,429 records, 3.3% (514/15,429) were for elderly patients. The treatment success rate (TSR) among elderly TB patients (68.3%) was lower than that of the non-elderly (80.9%) and the overall TSR 80.5%, (12,417/15,429) in Kampala. Although the elderly were less likely to test positive for HIV than the young (AOR 0.39; 95% CI 0.33-0.48, p<0.001), they had a two-fold higher risk of unfavorable treatment outcomes (AOR 2.14; CI 1.84-2.72, p<0.001) and were more likely to die while on treatment (AOR 1.86; CI 1.27-2.73; p = 0.001). However, there was no statistically significantly difference between treatment outcomes among HIV-positive and HIV-negative elderly TB patients. Compared to the younger TB patients, elderly TB patients have markedly poorer treatment outcomes, although TB/HIV co-infection rates in this age group are lower.


Asunto(s)
Antituberculosos/uso terapéutico , Tuberculosis Resistente a Múltiples Medicamentos/tratamiento farmacológico , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Resultado del Tratamiento , Tuberculosis Pulmonar/tratamiento farmacológico , Uganda
12.
MMWR Morb Mortal Wkly Rep ; 66(12): 339-342, 2017 Mar 31.
Artículo en Inglés | MEDLINE | ID: mdl-28358797

RESUMEN

In 2012, Uganda introduced the use of GeneXpert MTB/RIF (Cepheid, Sunnyvale CA), a sensitive, automated, real-time polymerase chain reaction-based platform for tuberculosis (TB) diagnosis, for programmatic use among children, adults with presumptive human immunodeficiency virus (HIV)-associated TB, and symptomatic persons at risk for rifampicin (RIF)-resistant TB. The effect of using the platform's Xpert MTB/RIF assay on TB care and control was assessed using routinely collected programmatic data; in addition, a retrospective review of district quarterly summaries using abstracted TB register data from purposively selected facilities in the capital city of Kampala was conducted. Case notification rates were calculated and nonparametric statistical methods were used for analysis. No statistically significant differences were observed in case notification rates before and after the Xpert MTB/RIF assay became available, although four of 10 districts demonstrated a statistically significant difference in bacteriologically confirmed TB. Once the GeneXpert MTB/RIF platform is established and refined, a more comprehensive evaluation should be conducted.


Asunto(s)
Automatización de Laboratorios , Técnicas de Diagnóstico Molecular/métodos , Mycobacterium tuberculosis/aislamiento & purificación , Vigilancia de la Población/métodos , Tuberculosis/diagnóstico , Adulto , Niño , Resistencia a Múltiples Medicamentos , Infecciones por VIH/epidemiología , Humanos , Mycobacterium tuberculosis/efectos de los fármacos , Estudios Retrospectivos , Tuberculosis/epidemiología , Uganda/epidemiología
13.
Emerg Infect Dis ; 20(8): 1280-6, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-25061906

RESUMEN

Super-resistant Plasmodium falciparum threatens the effectiveness of sulfadoxine-pyrimethamine in intermittent preventive treatment for malaria during pregnancy. It is characterized by the A581G Pfdhps mutation on a background of the double-mutant Pfdhps and the triple-mutant Pfdhfr. Using samples collected during 2004-2008, we investigated the evolutionary origin of the A581G mutation by characterizing microsatellite diversity flanking Pfdhps triple-mutant (437G+540E+581G) alleles from 3 locations in eastern Africa and comparing it with double-mutant (437G+540E) alleles from the same area. In Ethiopia, both alleles derived from 1 lineage that was distinct from those in Uganda and Tanzania. Uganda and Tanzania triple mutants derived from the previously characterized southeastern Africa double-mutant lineage. The A581G mutation has occurred multiple times on local Pfdhps double-mutant backgrounds; however, a novel microsatellite allele incorporated into the Tanzania lineage since 2004 illustrates the local expansion of emergent triple-mutant lineages.


Asunto(s)
Resistencia a Medicamentos , Antagonistas del Ácido Fólico/farmacología , Malaria Falciparum/epidemiología , Malaria Falciparum/parasitología , Plasmodium falciparum/efectos de los fármacos , Adolescente , Alelos , Niño , Preescolar , Dihidropteroato Sintasa/genética , Resistencia a Medicamentos/genética , Etiopía/epidemiología , Frecuencia de los Genes , Haplotipos , Humanos , Lactante , Repeticiones de Microsatélite , Mutación , Plasmodium falciparum/genética , Tanzanía/epidemiología , Tetrahidrofolato Deshidrogenasa/genética , Uganda/epidemiología , Adulto Joven
14.
PLoS Med ; 6(4): e1000055, 2009 Apr 14.
Artículo en Inglés | MEDLINE | ID: mdl-19365539

RESUMEN

BACKGROUND: Although the molecular basis of resistance to a number of common antimalarial drugs is well known, a geographic description of the emergence and dispersal of resistance mutations across Africa has not been attempted. To that end we have characterised the evolutionary origins of antifolate resistance mutations in the dihydropteroate synthase (dhps) gene and mapped their contemporary distribution. METHODS AND FINDINGS: We used microsatellite polymorphism flanking the dhps gene to determine which resistance alleles shared common ancestry and found five major lineages each of which had a unique geographical distribution. The extent to which allelic lineages were shared among 20 African Plasmodium falciparum populations revealed five major geographical groupings. Resistance lineages were common to all sites within these regions. The most marked differentiation was between east and west African P. falciparum, in which resistance alleles were not only of different ancestry but also carried different resistance mutations. CONCLUSIONS: Resistant dhps has emerged independently in multiple sites in Africa during the past 10-20 years. Our data show the molecular basis of resistance differs between east and west Africa, which is likely to translate into differing antifolate sensitivity. We have also demonstrated that the dispersal patterns of resistance lineages give unique insights into recent parasite migration patterns.


Asunto(s)
Antimaláricos/farmacología , Dihidropteroato Sintasa/genética , Resistencia a Medicamentos/genética , Malaria Falciparum/tratamiento farmacológico , Proteínas de Transporte de Membrana/genética , Plasmodium falciparum/efectos de los fármacos , Proteínas Protozoarias/genética , África/epidemiología , Alelos , Animales , Antimaláricos/uso terapéutico , Cloroquina/farmacología , Cloroquina/uso terapéutico , ADN Protozoario/genética , Combinación de Medicamentos , Humanos , Malaria Falciparum/epidemiología , Malaria Falciparum/parasitología , Malaria Falciparum/prevención & control , Repeticiones de Microsatélite , Filogenia , Plasmodium falciparum/enzimología , Plasmodium falciparum/genética , Plasmodium falciparum/aislamiento & purificación , Polimorfismo de Nucleótido Simple , Vigilancia de la Población , Pirimetamina/farmacología , Pirimetamina/uso terapéutico , Selección Genética , Sulfadoxina/farmacología , Sulfadoxina/uso terapéutico
15.
Trans R Soc Trop Med Hyg ; 100(4): 327-34, 2006 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-16289631

RESUMEN

Humanitarian medical programmes in the tropics have the opportunity to provide beacons of good practice. The use of modern drugs and diagnostics, a lack of bureaucracy, adequate budgets, motivated staff and well-functioning supply lines all contribute to the success of this approach. At a joint meeting of the Royal Society of Tropical Medicine, the London School of Hygiene and Tropical Medicine, Médecins Sans Frontières and Merlin, new data were presented on the outcomes of recent humanitarian programmes to control malaria (Ethiopia), human African trypanosomiasis (south Sudan), Lassa fever (Sierra Leone) and tuberculosis (Tomsk, former USSR).


Asunto(s)
Fiebre de Lassa/prevención & control , Malaria/prevención & control , Misiones Médicas , Tripanosomiasis Africana/prevención & control , Tuberculosis Pulmonar/prevención & control , Antimaláricos/uso terapéutico , Arteméter , Artemisininas/uso terapéutico , Actitud Frente a la Salud , Niño , Preescolar , Control de Enfermedades Transmisibles/organización & administración , Infección Hospitalaria/prevención & control , Eflornitina/uso terapéutico , Etanolaminas/uso terapéutico , Etiopía , Femenino , Fluorenos/uso terapéutico , Humanos , Lumefantrina , Embarazo , Sierra Leona , Sudán , Tripanocidas/uso terapéutico , U.R.S.S.
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