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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Countries who have no testing capacity can send their samples to the WHO appointed 2019-nCoV referral laboratories for testing. National 2019-nCoV laboratories with limited experience are encouraged to send the first five positives and the first ten negative 2019-nCoV samples to their referral labor...atories for confirmation.
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Interim guidance for entomologists.
This document describes selected sampling methods that can be used to conduct surveillance of Aedes mosquitoes, pupae and oviposition. It is intended for qualified entomologists at national and sub-national level who are responsible for the surveillance of local ...Aedes populations.
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Background: Little is known about post-traumatic stress (PTSD) prevalence rates in community samples. This is especially true for the African continent where child-soldiers, HIV/AIDS affected and orphans have been the target for PTSD prevalence studies. Objectives: The aim of this study is to invest...igate the indirect and direct exposure to 20 potentially traumatic events and its relation with PTSD in a Ugandan sample of senior 3rd year students and to perform cross-cultural comparisons with previous studies examining this age group. Socio-economic status, coping styles, negative affect, and somatization are further examined.
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Summary of new viruses this week: Afghanistan –five wild poliovirus type 1 (WPV1) positive environmental samples. Pakistan –one WPV1 positive environmental sample. Papua New Guinea – three cases of circulating vaccine-derived poliovirus type 1 (cVDPV1). DRC- one case of circulating vaccine-der...ived poliovirus type 2 (cVDPV2). Nigeria – two cases of cVDPV2. Somalia- two cVDPV2 positive environmental samples. See country sections below for more details.
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The purpose of this study was to document a technical assessment of a sample of these existing shelters on their functionality, accessibility, operation and management, community perspectives in Myanmar; identify gaps, needs and further the linkages with community-based disaster risk reduction (CDBR...R) activities. The study also aims at a wider assessment: looking at broader recovery in terms of shelter and livelihood aspects with clear linkages and strategic direction for future cyclone shelter support activities.
No publication year indicated.
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The purpose of this document is to provide guidance on the use of pooled sample testing strategy in coronavirus disease (COVID-19)
testing laboratories of the African Union Member States for scaling up SARS-CoV-2 nucleic acid testing capacity with the available resources. The current document descr...ibes the effect of factors such as the prevalence of COVID-19 in the population to be tested, the homogeneity of pools, and the sensitivity of the molecular test in optimal pool size determination. It also highlights the importance of monitoring the prevalence of COVID-19 in a population to be tested and proper validation of the test, to limit the potential for false-negative results. Validation studies to determine the optimal pool size by testing laboratories are recommended as the optimum approach. A safe, simple ‘two-stage pooling’ option has been indicated in this guidance to be used by laboratories until such validation can be achieved.
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Interim Guidance 31 march 2020
WHO has established a shipment mechanism to expedite and cover the costs of the shipment of clinical samples from patients with suspected COVID-19 from the country of collection to one of the WHO reference laboratories providing confirmatory molecular testing for COVI...D-19. This document explains the process and documentation required for shipment of specimens.
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Summary of new viruses this week: Pakistan—three wild poliovirus type 1 (WPV1) cases and five WPV1-positive environmental samples; Nigeria—one circulating vaccine derived poliovirus type 2 (cVDPV2)-positive environmental sample; and, Niger—one cVDPV2 isolated from a healthy community. See coun...try sections below for more details.
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This report describes findings from a telephone survey with 1,284 people conducted in February 2021. The survey examined how people respond to public health and social measures (PHSMs) to prevent COVID-19. The sample is representative of households with access to a landline or cell phone, but does n...ot include people without access to phones. As phone penetration varies by country, findings should be interpreted with caution.
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This report is from the National study on living conditions among people
with disabilities carried out in Nepal in 2014-2015. The study was carried
out as a household survey with two-stage stratified sampling, including a screening/listing procedure using the Washington Group on Disability
Statis...tics 6 questions, one Household questionnaire administered to
households with (Case HHs) and without disabled members (Control
HHs), one Individual Case questionnaire administered to individuals who were found to qualify as being disabled in the screening (Case
individuals), and an Individual Control questionnaire administered to
matched non-disabled individuals in the Control HHs (Control individuals). The study covers a range of indicators on level of living, such as socioeconomic indicators, economic activity, income, ownership and infrastructure, health (including reproductive health), access to health information, access to services, education, access to information, social participation, and exposure to discrimination and abuse (see all
questionnaires in Appendix).
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This manual is intended for mid-level rehabilitation workers on work with children with communication difficulties and their families. The manual contains information on general aspects of communication, causes of communication impairment, sample assessments, and advice for parents and those involve...d in the training of health and education workers. You can download section by section from the website
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The provision of safe and efficacious blood and blood components for transfusion or manufacturing use involves a number of processes, from the selection of blood donors and the collection, processing and testing of blood donations to the testing of patient samples, the issue of compatible blood and ...its administration to the patient. There is a risk of error in each process in this “transfusion chain” and a failure at any of these stages can have serious implications for the recipients of blood and blood products. Thus, while blood transfusion can be life-saving, there are associated risks, particularly the transmission of bloodborne infections.
Screening for transfusion-transmissible infections (TTIs) to exclude blood donations at risk of transmitting infection from donors to recipients is a critical part of the process of ensuring that transfusion is as safe as possible. Effective screening for evidence of the presence of the most common and dangerous TTIs can reduce the risk of transmission to very low levels.
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March 2021
This report presents the key findings of the NFHS-5 survey in the National Capital Territory (NCT) of Delhi, followed by detailed tables and an appendix on sampling errors. The 2019-21 National Family Health Survey (NFHS-5), the fifth in the NFHS series, provides information on populatio...n, health, and nutrition for India and each state and union territory.
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Limited research has examined factors associated with psychological distress following natural
disasters among non-Western child populations. Conditions associated with trauma-related symptoms following the 2004 tsunami in a sample of 265 Sri Lankan child survivors (53.6% female, aged 3 to 17) were... examined retrospectively. Multivariate regression analyses identified pre-traumatic conditions (female gender, prior health) and peritraumatic conditions (loss of family, complete property loss) as being associated with increased trauma-related symptoms. Findings can be applied to the identification of children most at risk of developing trauma-related symptoms following a natural disaster from a non-Western population to aid development of culturally-appropriate interventions.
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Four (04) new EVD alerts were reported from Rubkona, Nimule, and juba during week 45 (ending 13 November 2022) but only one sample was collected for laboratory confirmation which tested negative. The other three were discarded as they did not meet EVD case definition.
This algorithm is addressed to laboratories
with established capacity(molecular, antigenic and/orserological) to detect dengue (DENV), Zika (ZIKV), and chikungunya(CHIKV) as part of the differential diagnosis for arborviruses. A BSL2 containment level is required to handle suspected samples.
CDI 2 WASH Program
The “Field Level Arsenic Testing Guideline” provides guidance for testing arsenic in groundwater in simple and cost-effective way. The guideline covers different aspects like costing involved in a testing program, justification of selecting field kits, sample collection p...rocedure, interferences, data management, quality control, safety, waste management issues along with the testing procedure. The guideline will be useful for all technicians, researchers and practitioners for practical purpose related to arsenic test for promoting safe water supply.
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The epidemiology of wheeze in children, when assessed by questionnaires, is dependent on parents' understanding of the term “wheeze”.
In a questionnaire survey of a random population sample of 4,236 children aged 6–10 yrs, parents' definition of wheeze was assessed. Predictors of a correct ...definition were determined and the potential impact of incorrect answers on prevalence estimates from the survey was assessed.
Current wheeze was reported by 13.2% of children. Overall, 83.5% of parents correctly identified “whistling or squeaking” as the definition of wheeze; the proportion was higher for parents reporting wheezy children (90.4%). Frequent attacks of reported wheeze (adjusted odds ratio (OR) 3.0), maternal history of asthma (OR 1.5) and maternal education (OR 1.5) were significantly associated with a correct answer, while the converse was found for South Asian ethnicity (OR 0.6), first language not English (OR 0.6) and living in a deprived neighbourhood (OR 0.6).
In summary, the present study showed that misunderstanding could lead to an important bias in assessing the prevalence of wheeze, resulting in an underestimation in children from South Asian and deprived family backgrounds. Prevalence estimates for the most severe categories of wheeze might be less affected by this bias and questionnaire surveys on wheeze should incorporate measures of parents' understanding of the term wheeze.
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May 2021
This report presents the key findings of the NFHS-5 survey in Andhra Pradesh, followed by detailed tables and an appendix on sampling errors. The 2019-21 National Family Health Survey (NFHS-5), the fifth in the NFHS series, provides information on population, health, and nutrition for Indi...a and each state and union territory.
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