DHS Analytical Studies No. 40
This report investigates the impact of potential misclassification of samples on HIV prevalence estimates for 23 surveys conducted from 2010-2014. In addition to visual inspection of laboratory results, we examined how accounting for potential misclassification of HIV status through Bayesian latent ...class models affected the prevalence estimates. Two types of Bayesian models were specified: a model that only uses the individual dichotomous test results and a continuous model that uses the quantitative information of the EIA (i.e., the signal-to-cutoff values). Overall, we found that adjusted prevalence estimates matched the surveys’ original results, with overlapping uncertainty intervals. This suggested that misclassification of HIV status should not affect the prevalence estimates in most surveys. However, our analyses suggested that two surveys may be problematic. The prevalence could have been overestimated in the Uganda AIDS Indicator Survey 2011 and the Zambia Demographic and Health Survey 2013-14, although the magnitude of overestimation remains difficult to ascertain. Interpreting results from the Uganda survey is difficult because of the lack of internal quality control and potential violation of the multivariate normality assumption of the continuous Bayesian latent class model. In conclusion, despite the limitations of our latent class models, our analyses suggest that prevalence estimates from most of the surveys reviewed are not affected by sample misclassification.
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How should humanitarian organisations prepare and respond to COVID-19 in humanitarian settings in low- and middle-income countries?
This Rapid Learning Review outlines 14 actions, insights and ideas for humanitarian actors to consider in their COVID-19 responses. It summarises and synthesises the... best available knowledge and guidance for developing a health response to COVID-19 in low- and middle-income settings as at April 2020
The paper, supported by the UN Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator Mark Lowcock, will be updated throughout 2020 to reflect emerging knowledge and evidence on the most effective approaches to respond to the COVID-19 Pandemic.
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