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Aedes aegypti larval indices and risk for dengue epidemics
No full textWe assessed in a case-control study the test-validity of Aedes larval indices for the 2000 Havana outbreak. "Cases" were blocks where a dengue fever patient lived during the outbreak. "Controls" were randomly sampled blocks. Before, during, and after the epidemic, we calculated Breteau index (BI) and house index at the area, neighborhood, and block level. We constructed receiver operating characteristic (ROC) curves to determine their performance as predictors of dengue transmission. We observed a pronounced effect of the level of measurement. The BI(max) (maximum block BI in a radius of 100 m) at 2-month intervals had an area under the ROC curve of 71%. At a cutoff of 4.0, it significantly (odds ratio 6.00, p<0.05) predicted transmission with 78% sensitivity and 63% specificity. Analysis of BI at the local level, with human-defined boundaries, could be introduced in control programs to identify neighborhoods at high risk for dengue transmission
Participación comunitaria en la prevención del dengue: un abordaje desde la perspectiva de los diferentes actores sociales
No full textOBJECTIVE: To explore the perceptions about community participation in dengue fever control during formative research for a community project. MATERIAL AND METHODS: This study was conducted in three health areas of the Santiago de Cuba municipality during the year 2000. Qualitative and quantitative techniques were used to explore the opinions of health professionals, community leaders and a random sample of 200 people living in the community. RESULTS: The health professionals who were interviewed judged that difficulties in Aedes aegypti control were due to lack of participation of the community and to limited knowledge of prevention methods. Community leaders considered that the population was poorly motivated.The randomly selected subjects who were interviewed did associate Aedes control with technological intervention.The authors identified barriers to acceptance of control program activities. In general, the concept of "participation" was interpreted as "collaboration". CONCLUSIONS: Our findings show that the community has transferred the responsibility for Aedes aegypti control to the health sector.There is an evident need for unifying the concepts of community participation, as well as for matching the interests of users and health care providers, in order to attain a significant social mobilization
Disintegrated care: the Achilles heel of international health policies in low and middle-income countries
No full textPURPOSE: To review the evidence basis of international aid and health policy. CONTEXT OF CASE: Current international aid policy is largely neoliberal in its promotion of commoditization and privatisation. We review this policy's responsibility for the lack of effectiveness in disease control and poor access to care in low and middle-income countries. DATA SOURCES: National policies, international programmes and pilot experiments are examined in both scientific and grey literature. CONCLUSIONS AND DISCUSSION: We document how health care privatisation has led to the pool of patients being cut off from public disease control interventions--causing health care disintegration--which in turn resulted in substandard performance of disease control. Privatisation of health care also resulted in poor access. Our analysis consists of three steps. Pilot local contracting-out experiments are scrutinized; national health care records of Colombia and Chile, two countries having adopted contracting-out as a basis for health care delivery, are critically examined against Costa Rica; and specific failure mechanisms of the policy in low and middle-income countries are explored. We conclude by arguing that the negative impact of neoliberal health policy on disease control and health care in low and middle-income countries justifies an alternative aid policy to improve both disease control and health care
Reproductive health services for refugee and host populations in Uganda: policy implications
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Neutralization kinetics of sensitive and resistant subtype B primary human immunodeficiency virus type 1 isolates
No full textThe aim of the study was to determine if sensitive and resistant human immunodeficiency virus type 1 (HIV-1) subtype B primary isolates have different neutralization kinetics. Neutralization assays were undertaken where either the time allowed for virus to react with antibodies or the subsequent period of this mixture's exposure to target cells were varied. The relative neutralization sensitivity/resistance is a reproducible property of the isolates. In a minority of combinations, the titre falls exponentially for as long as the free virions are exposed to antibody. In the remainder, neutralization kinetics shows deviations which may be attributed to events occurring after the virus-antibody mixture is added to the target cells: significant neutralization with minimal exposure of the free virions to antibody; a plot where reduction in virus titre is parallel to the duration of the incubation phase of the assay. Neutralization rate constants are similar for primary HIV-1 SF33, HIV-1 SF162, and HIV-1 89.6, reaching 5 x 10(5)-1 x 10(6)/M sec for the monoclonal antibody IgG1 b12. However, although increased antibody levels produced greater reductions in virus titre the rate of neutralization was not proportional to the antibody concentration. Neutralization of either the free virion or cell-associated virus does not correlate with the resistance/sensitivity of primary subtype B isolates. The target cells play an active role, so that in designing neutralization assays with primary isolates of HIV-1, events following the virus-antibody complex binding to the cell surface have to be taken into consideration
Risk factors for Buruli ulcer, Benin
No full textWe identified risk factors for Buruli ulcer (BU) in Benin in an unmatched case-control study at the Centre Sanitaire et Nutritionnel Gbemoten in southern Benin. A total of 2,399 persons admitted from 1997 through 2003 and 1,444 unmatched patients with other conditions in 2002 were recruited. Adjusted odds ratios were determined for age, sex, place of residence, Mycobacterium bovis BCG vaccination at birth, type of water for domestic use, and occupation. Children 49 years of age had a higher risk for BU. Use of unprotected water from swamps was associated with increased risk for BU; this association was strongest in adults >49 years of age. Sex was not a risk factor for BU. Our data showed that BU was mainly associated with age, place of residence, and water sources in all age groups. Risk for BU was higher in BCG-vaccinated patients > or =5 years of age
Scaling-up highly active antiretroviral therapy (HAART) in Peru: problems on the horizon [letter]
No full textNot the final published versio
Performance evaluation of the two protease sequencing primers of the Trugene HIV-1 genotyping kit
No full textThis article describes the performance of the two protease sequencing modules available in the Trugene HIV-1 genotyping Kit on a sample population with a high prevalence of HIV-1 non-B subtypes (n=110). The relevance of the algorithm recommended by the kit was also evaluated. The results indicated a high sequencing failure rate of the PR module (34%). Forty-five percent of the failed sequences derived from non-B subtype viruses. Furthermore, no PR sequence could be obtained from any of the HIV-1 subtype A and C infected samples that were tested. In contrast, a sequence could be obtained from the entire panel using the P2 module. The data indicated that the high rate of sequencing failures of the PR module was related to both the HIV-1 non-B subtypes as well as lower levels of RNA viral load. In six out of the 73 samples for which both protease modules were successful, discrepancies between the two protease sequences were observed, which led to discordant resistance reports in two cases. The data highlight the problems and the clinical implications that may occur during resistance genotyping of clinical samples with a high prevalence of HIV-1 non-B subtypes
Application of the resazurin microtitre assay for detection of multidrug resistance in Mycobacterium tuberculosis in Algiers
No full textThis study assessed the performance of a rapid, low-cost, colorimetric method, the resazurin microtitre assay (REMA) plate method, for the detection of resistance to isoniazid and rifampicin in 136 clinical isolates of Mycobacterium tuberculosis from two hospitals in Algiers. MICs were determined and the results were compared with those obtained with the conventional proportion method on Löwenstein-Jensen medium. Excellent results were obtained for the REMA plate method, with a sensitivity of 100 % for both isoniazid and rifampicin and a specificity of 98.3 and 99.2 %, respectively. The REMA plate method appears to be a reliable method for the rapid determination of multidrug-resistant tuberculosis and is a good alternative for use in resource-limited countries such as Algeria