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Biomedical subjects

Patrick Van der Stuyft

Publications and source records attributed to Patrick Van der Stuyft.

At least 19 recordsLinked to original sources
PubMed2006

Achieving sustainability of community-based dengue control in Santiago de Cuba.

Achieving sustainability is one of the major current challenges in disease control programmes. In 2001-2002, a community-based dengue control intervention was developed in three health zones of Santiago de Cuba. New structures (heterogeneous community working groups and provincial/municipal coordination groups inserted in the vertical programme) were formed and constituted a key element to achieve social mobilization. In three control zones, routine programme activities were intensified. We evaluated the sustainability of the intervention strategy over a period of 2 years after the withdrawal of external support. Data on maintenance of effects, level of institutionalization and continuity of activities through capacity building were collected via documental review, direct observation, questionnaires, key informant and group interviews and routine entomological surveys. The intervention effects, evaluated through larval indices and behavioural change indicators, were maintained during the 2 years of follow-up. In the intervention area, 87.5% of the water storage containers remained well covered in 2004 and 90.5% of the families continued to correctly use a larvicide, against 21.5% and 63.5%, respectively in the control area. The house indices further declined from 0.35% in 2002 to 0.17% in 2004 in the intervention area, while in the control area they increased from 0.52% to 2.25%. Institutionalization of the intervention, assessed in terms of degrees of intensiveness (passage, routine, niche saturation), was reaching saturation by the end of the study. Key elements of the intervention had lost their separate identity and became part of the control programme's regular activities. The host organization adapted its structures and procedures accordingly. Continuous capacity building in the community led to participatory planning, implementation and evaluation of the Aedes control activities. It is concluded that, in contrast to intensified routine control activities, a community-based intervention approach promises to be sustainable.

Animals↗
PubMed2006

Colombia and Cuba, contrasting models in Latin America's health sector reform.

Latin American national health systems were drastically overhauled by the health sector reforms the 1990s. Governments were urged by donors and by the international financial institutions to make major institutional changes, including the separation of purchaser and provider functions and privatization. This article first analyses a striking paradox of the far-reaching reform measures: contrary to what is imposed on public health services, after privatization purchaser and provider functions are reunited. Then we compare two contrasting examples: Colombia, which is internationally promoted as a successful--and radical--example of 'market-oriented' health care reform, and Cuba, which followed a highly 'conservative' path to adapt its public system to the new conditions since the 1990s, going against the model of the international institutions. The Colombian reform has not been able to materialize its promises of universality, improved equity, efficiency and better quality, while Cuban health care remains free, accessible for everybody and of good quality. Finally, we argue that the basic premises of the ongoing health sector reforms in Latin America are not based on the people's needs, but are strongly influenced by the needs of foreign--especially North American--corporations. However, an alternative model of health sector reform, such as the Cuban one, can probably not be pursued without fundamental changes in the economic and political foundations of Latin American societies.

Colombia↗
PubMed2006

Visceral leishmaniasis in southeastern Nepal: a cross-sectional survey on Leishmania donovani infection and its risk factors.

OBJECTIVE: To document the frequency of Leishmania donovani infection at community level in a highly endemic region in southeastern Nepal, and to assess socioeconomic and environmental risk factors. METHODS: A random cross-sectional population survey was held in two visceral leishmaniasis (VL) foci in Morang District in April to May 2003, enrolling individuals 2 years or older and residing in the endemic area for at least 12 months. Leishmania infection was defined as a direct agglutination test (DAT) titre equal to or higher than 1:3200. Risk factors were identified by logistic regression. RESULTS: The direct agglutination test was positive in 7.5% (95% CI: 5.1-10.8) and the leishmanin skin test (LST) in 13.2% (95% CI: 9.9-17.2) of the 373 study participants. No case of current kala-azar was found, but 5.1 % (95% CI: 3.1-7.8) reported having suffered from VL. Independent risk factors for Leishmania infection were proximity of the house to ponds [odds ratio (OR) 3.7, 95% CI: 1.6-8.5], family size (OR 4.4, 95% CI: 1.6-12.6), age > or =15 years (OR 5.5, 95% CI: 1.2-25.0) and house constructed in mud (OR 3.0, 95% CI: 1.1-7.6). Bednets, not impregnated and in poor condition, were used by 95.2% (95% CI: 92.3-97.0) of the population, but did not show any protective effect. CONCLUSION: This study shows that there is a serious problem of transmission of VL in this area of Nepal. The risk factors identified are linked with the socioeconomic level and the environment. The population would benefit from a community intervention to improve the environmental and housing conditions in the villages.

Adolescent↗
PubMed2006

Serosurvey on household contacts of Marburg hemorrhagic fever patients.

The first major outbreak of Marburg hemorrhagic fever (MHF) outside a laboratory environment occurred in the subdistrict of Watsa, Democratic Republic of Congo, from October 1998 to August 2000. We performed a serosurvey of household contacts of MHF patients to identify undetected cases, ascertain the frequency of asymptomatic Marburg infection, and estimate secondary attack risk and postintervention reproduction number. Contacts were interviewed about their exposure and symptoms consistent with MHF. Blood samples were tested for anti-Marburg immunoglobulin G (IgG). One hundred twenty-one (51%) of 237 identified contacts participated; 72 (60%) were not known to the health authorities. Two participating contacts were seropositive and reported becoming ill after the contact; no serologic evidence for asymptomatic or mild Marburg infection was found. The secondary attack risk was 21%; the postintervention reproduction number was 0.9, consistent with an outbreak sustained by repeated primary transmission, rather than large-scale secondary transmission.

Adolescent↗
PubMed2005

Shifting the demand for emergency care in Cuba's health system.

Cuba has developed a programme of quality improvement of its health services, which includes an extramural emergency care system in which polyclinics and general practitioner networks play an important role. Using routine health information from the decentralised first line emergency units (FLES) and from the hospital emergency service (HES) for the period 1995-2000, we evaluated the effects of the emergency care subsystem reform on the utilisation rates of first line and hospital services in Baracoa and Cerro, a rural and a metropolitan municipality, respectively. In the self-contained health system of Baracoa, the reform of the emergency subsystem resulted in a first phase of increased utilisation of the FLES, followed by a second phase of gradual decrease, during which there was an increased utilisation of general practitioners. In contrast, the overall results of the reform in Cerro were unclear. The proximity to a hospital seems to be the most important element in the patient's decision on which entry point to the Cerro health system to use. A potential adverse effect of the reform is an increased emergency services utilisation in situations where GP care remains below patients' expectations. Given the current world-wide trends in health-care reform, the organisational alternatives developed in the Cuban health system might remain specific to the local contextual setting.

Cuba↗
PubMed2005

Street youths are the only high-risk group for HIV in a low-prevalence South American country.

OBJECTIVES: To measure HIV prevalence in various subpopulations in Bolivia. DESIGN: In 2002 in Cochabamba, we offered voluntary counseling and testing to homeless street youths, registered and unregistered commercial sex workers, truck drivers, and prisoners. We examined surveillance data of pregnant women and blood donors. RESULTS: Among street youths over 15, overall HIV prevalence was 3.5% (11/313), higher among those recruited in the street, lower among those recruited in centers for homeless; prevalence was 0.6% (2/334) and 0.5% (1/189) in female registered and nonregistered sex workers, respectively, and below 0.3% in all other groups. All HIV cases were attributed to sexual transmission. CONCLUSION: In a low-prevalence setting where intravenous drug use is uncommon, street youths are a threat for the expansion of the HIV epidemic. We argue that HIV prevention in this population requires a comprehensive approach to their health and social problems.

Adolescent↗
PubMed2005

The validity of serologic tests for Trypanosoma cruzi and the effectiveness of transfusional screening strategies in a hyperendemic region.

BACKGROUND: This study aims at obtaining unbiased estimates of the sensitivity and specificity of existing screening tests for Trypanosoma cruzi and at simulating the effectiveness of alternative screening strategies at different prevalence rates. STUDY DESIGN AND METHODS: A systematic random sample of 400 was taken from 1200 banked serum samples of donors screened between August 1998 and January 1999 in Santa Cruz, Bolivia. Samples were tested with indirect hemagglutination test (IHA), indirect immunofluorescence assay (IFA), and four enzyme-linked immunosorbent assays (ELISAs). Sensitivity and specificity of tests were estimated through latent class analysis. RESULTS: The sensitivity of individual tests ranged from 96.5 to 100 percent, and their specificity from 87.0 to 98.9 percent. Combinations of two tests used in parallel would, even at 40 percent prevalence, only miss approximately 1 infected unit per 10,000 screened. At 5 percent prevalence, however, they would yield 75 to 120 false-positive units per 1000 units screened. Parallel testing with IHA plus ELISA or with IHA plus IFA is marginally more cost-effective, compared to single IHA testing, than single ELISA or single IFA testing, regardless of the T. cruzi prevalence. CONCLUSIONS: Routine blood donor screening for T. cruzi with a single test results in unacceptable numbers of false-negative samples in highly endemic areas or in at risk population groups. Adding a second test seems mandatory, but which one to choose depends on local cost components and feasibility.

Animals↗
PubMed2005

Neurolathyrism risk depends on type of grass pea preparation and on mixing with cereals and antioxidants.

OBJECTIVE: To study an array of household individual and dietary risk factors for neurolathyrism. METHOD: Case-control study using recent cases in a district highly affected by the recent neurolathyrism epidemic in Ethiopia: 108 households with cases and 104 households with no cases; 170 neurolathyrism cases, 370 intra-family controls and 170 community controls frequency matched for age and sex. RESULTS: A history of acute illness was associated with a two- and threefold increased risk of paralysis in community and intra-family controls, respectively. Soaking grass pea in water before cooking roughly halved the risk of neurolathyrism but cooking in clay utensils more than quadrupled it. Consumption of grass pea in the green unripe and boiled forms increased the risk 10 times or more. Mixing the food with gravy that contains condiments with antioxidant activity reduced it by a factor of 4. The consumption of grass pea mixed with cereals rich in sulphur amino acids was also highly protective, but the magnitude of the effect depended on the grass pea preparation consumed. CONCLUSION: Consumption of pure grass pea, especially in the green unripe and boiled forms, should be avoided. Communities at risk of neurolathyrism during famine crises should be encouraged to combine and use grass pea with cereals before the household cereal stock is fully depleted. Breeding programmes, alongside traditional attempts to reduce the toxin content, should enhance the content of sulphur amino acids and antioxidants in grass pea.

Adolescent↗
PubMed2004

The effectiveness of active population screening and treatment for sleeping sickness control in the Democratic Republic of Congo.

BACKGROUND: The human African trypanosomiasis (HAT) control programme of the Democratic Republic of Congo (DRC) uses mass screening with the card agglutination test for trypanosomes (CATT). We looked at the contribution of CATT and improved parasitological confirmation to the effectiveness of screening and treatment. METHOD: The effectiveness of the screening and treatment process is measured by the percentage of HAT cases that is effectively cured after a single round of screening. The process is analysed in five steps: (i) the attendance at the screening, (ii) the sensitivity of the screening procedure, (iii) the sensitivity of the parasitological confirmation, (iv) the proportion of the confirmed cases that effectively receive treatment and (v) the cure rate of the treatment. We used a simplified model that multiplies proportions of infected persons that go through each step. We estimated these parameters using a combination of routine data collected by the national control programme over the period January 1997 to December 1998 and published data. For varying attendance rates we compared the effectiveness of screening strategies based on CATT or on CATT combined with improved parasitological confirmation by mini anion exchange column technique (mAECT) with the previously used strategy based on palpation of neck glands and microscopy alone. RESULTS: The model shows that overall effectiveness of the active case detection and treatment strategy is <50% under most scenarios. Attendance rates averaged 74% but showed considerable regional variability and are a major problem in some areas of DRC. The CATT and replacing traditional parasitology by mAECT increases the sensitivity of the screening but a substantial part of the gains are lost at other stages of the screening process. CONCLUSION: Improvements of the HAT screening process such as introduction of CATT or mAECT only make sense if other parameters and attendance rate in particular are optimized at the same time.

Agglutination Tests↗
PubMed2004

A framework for analysing the relationship between disease control programmes and basic health care.

In this paper, we present a framework for analysing the complex relationship between disease control programmes and basic health care systems. Many of the ideas and concepts presented in this paper were developed by the staff of the Public Health Department of the Antwerp Institute of Tropical Medicine (ITM) over the last 20 years. They are thus the product of the reflection of an entire team.

Attitude of Health Personnel↗
PubMed2004

[Community participation in the control of Aedes aegypti: opinions of the population in one section of Havana, Cuba].

OBJECTIVE: To analyze opinions on community participation held by residents of one section of the city of Havana, Cuba, in order to identify key criteria to use in preparing a participatory strategy for controlling the Aedes aegypti mosquito. METHODS: The study was conducted from September to October 1999 in Playa, one of the 15 municipios (districts) that make up the city of Havana, Cuba. In the first phase of the study, interviews were carried out with key informants, including health brigade members and sanitation activists, who had lived in Playa for more than five years. The key informants were selected randomly from the nine health areas that the Playa municipio has. Qualitative content analysis was used to identify terms, common expressions, and key concepts related to community participation in the area. In the study's second phase a questionnaire using a Likert scale was prepared for application with a population sample from Playa. Based on the answers from the respondents, a point score with a confidence interval was calculated for each of the 30 statements on the questionnaire. The point scores for those statements were used to identify the population's most relevant criteria, that is, the statements producing the strongest agreement and the ones producing the strongest disagreement. RESULTS: In the first phase, from the interviews with key informants, the three most important variables to explore were identified as: (1) community participation in environmental cleanup, (2) the role and image of community leaders and of community organizations, and (3) community participation, in a general sense, in solving any problem in the community. In the second phase, the population survey indicated that the members of the community recognized the usefulness of community participation in solving local problems, especially for controlling A. aegypti. Among the statements on the questionnaire that had the highest levels of agreement were ones dealing with the value of working together as a team, the knowledge that local authorities had of community problems, and recognition of the obligation that citizens have to take part in developing the community. The statements that had the lowest level of agreement had to do with the need to reward-with more than just words of thanks-residents who regularly serve the community and with the view that the majority of community leaders were more concerned with their personal well-being than with the problems of the community. CONCLUSIONS: The opinions on community participation identified among the population in Playa served as the basis for designing new strategies for controlling A. aegypti. The methodology utilized in this study could be used to plan local participatory processes, both in Cuba and in other countries, and could be applied to other problems whose solution requires community participation.

Aedes↗
PubMed2004

Unhealthy European health policy.

The European Union claims that the defense of its welfare state is one of today's most important challenges. This article analyzes whether the European governments and the European Union really pursue a policy that strengthens their health and social security systems, or one that is in itself a threat to health and social security. After a summary of the origin and evolution of the European health systems, the authors pinpoint underlying reasons for reform and demonstrate how, since the 1990s, the European Union has built a strict financial and political straitjacket, forcing these systems to carry out privatization and cutbacks. Reform measures can be divided into three interdependent categories: (1) the increasing influence of governments on health care organization, to enable restructuring; (2) measures aimed at reducing public expenses, including higher financial contributions by patients and restrictions on the range of services provided; and (3) measures that establish competition and hidden or open privatization of services and insurance systems. Through these mechanisms public expenses are reduced while private health care expenses (and private profits) rise freely. Ongoing European health care reforms thus struggle with the contradictions between responding to growing collective needs and securing or increasing private profits.

Delivery of Health Care↗
PubMed2004

A comparative study of the effectiveness of diagnostic tests for visceral leishmaniasis.

We compared the validity of pancytopenia, the formol-gel test (FGT), the indirect fluorescence antibody test (IFAT), the direct agglutination test (DAT), and the rK39 dipstick test as diagnostic criteria for visceral leishmaniasis (VL) in Nepal. Between September 2000 and January 2002, 310 clinical suspects had a bone marrow aspirate, and if negative, a spleen aspirate smear examined for Leishmania donovani. Sensitivity and specificity of all tests were determined compared with parasitology and by latent class analysis (LCA). Compared with parasitology, the sensitivities of the other tests were as follows: pancytopenia = 16.3% (95% confidence interval [CI] = 11.3-22.5%), FGT = 39.9% (95% CI = 32.7-47.4%), IFAT = 28.4% (95% CI = 22.0-35.5%), DAT = 95.1% (95% CI = 90.8-97.7%), and the rK39 dipstick test = 87.4% (95% CI = 81.7-91.9%). Sensitivity estimates obtained by LCA were similar, but specificity estimates were substantially higher (DAT = 93.7% versus 77.8%; rK39 dipstick test = 93.1% versus 77.0%). The DAT or the rK39 dipstick test can replace parasitology as the basis of a decision to treat VL in Nepalese peripheral health services.

Adolescent↗
PubMed2003

Food-aid cereals to reduce neurolathyrism related to grass-pea preparations during famine.

Neurolathyrism is a spastic paraparesis that can be caused by excessive consumption of the drought-resistant grass pea (Lathyrus sativus). Devastating neurolathyrism epidemics have occurred during major famine crises in various parts of the world. We investigated in a case-control study the effects of food aid on risk of paralysis. Risk increased with consumption of boiled grass pea (adjusted odds ratio 2.78, 95% CI 1.09-7.13 with cereals; 5.22, 2.01-13.55 without cereal) and raw unripe green grass pea (1.96, 1.16-3.31; p=0.011), but not with the fermented pancake, unleavened bread, and gravy preparations. In a correlational study there was an inverse relation between the number of new cases and the amount of food-aid cereals distributed per person. During famine, cereals and nutritional information should reach people before they have grass pea as the only food.

Case-Control Studies↗