PAHO

Haiti

A knowledge co-production strategy to address systematic non-compliance with MDA for Lymphatic Filariasis in Leogane, Haiti

The researchers propose taking a novel approach to increase coverage and reach previously neglected populations by engaging non-compliant individuals in devising a more effective strategy through a technique called knowledge co-production. The researchers plan to address the following questions:

  1. Can an intervention package co-produced with systematically non-compliant individuals result in increased MDA coverage between the 2019 and 2020 LF MDA rounds?
  2. Who and where are the systematic non-compliers in Leogane and Gressier?
  3. What are the reasons motivating systematic non-compliance?
  4. Is MDA non-compliance associated with hotspots of LF transmission?

The researchers plan the following activities:

  1. A household cluster survey with 1300 individuals of all ages. This will define coverage in the past MDA and identify non-compliant individuals. In addition, ‘hidden’ non-compliers (NCs) will be located by a networking approach (respondent-driven sampling [RDS]).
  2. All NCs will then be eligible to be selected into groups of 10 by age (18-25; 26-50; >50), sex (M, F) and demography (urban/rural). These 12 groups will each work with the national health team to devise new approaches to the non-compliance issue. These will be put into place for the 2020 MDA and then assessed by the co-production strategy groups. After the 2020 MDA a second survey will occur to assess impact.
  3. The relationship between non-compliance and hotspots will be assessed using spatial analysis and defined serologically (FTS and DBS for antibodies) in collaboration with CDC.
Countries: Haiti

Investigating the role of drug delivery strategy in MDA drug coverage

Haiti, like many other countries, has made considerable progress in the elimination of lymphatic filariasis. To date, 118 out of 140 communes have passed TAS and stopped MDA. However, little is understood about why some communes have persistent transmission despite five or more rounds of MDA. The proposed study aims to identify alternative approaches to MDA that may help to increase access, uptake, and coverage, particularly for individuals who typically do not comply with MDAs. This cluster-randomized design will test a novel approach (door to door strategy) against the standard health post-based delivery method. Additionally, the study aims to identify non-compliant individuals and better understand their reasons for non-participation. Furthermore, a cost analysis will be undertaken as part of this study to understand the potential implications for the country program should the door-to-door strategy prove effective in reaching higher numbers of people.

Countries: Haiti

Addressing the Mental Health of Persons Living with Lymphatic Filariasis in Léogâne, Haiti: Effectiveness of a Chronic Disease Self-Management Program

Intervention: The primary aim of this project is to determine if the introduction of a Chronic Disease Self-Management curriculum into existing Hope Clubs in Léogâne, Haiti will result in improvements in symptoms of depression, self-rated health, chronic disease self-efficacy, social support, and disability.

Formative: What are the barriers that prevent people with LF from participating in Hope Clubs?

Countries: Haiti

Lymphatic Filariasis Positive-Case Follow-up After TAS 2 in Haiti

To identify the sampling strategy for positive case follow-up after TAS 2 and TAS 3 that optimizes the chances of correctly identifying evidence of ongoing transmission, while saving program resources.

Countries: Haiti

Field Validation of Wb123 monoplex, Haiti

To compare the performance of antigen (FTS) and antibody (Wb123 monoplex) tools in programmatic settings (TAS).

Preliminary Findings and Lessons Learned

The goal of this study is to compare the performance of antigen (FTS) and antibody (Wb123 monoplex, Wb123 ELISA, multiplex) tools in programmatic settings (TAS). In order to strengthen the existing TAS platform we need to better understand which diagnostic indicator(s) are best-suited for making programmatic decisions. The TAS was conducted in Trou de Nord and Plaisance EUs.  Both EUs passed the TAS, but positive FTS were identified (4 and 2, respectively). However the Wb123 RDT found ZERO positive children, of the over 2000 tested. While the Wb123 ELISA testing is still ongoing, this initial result agrees with findings from other studies, all of which suggest that the Wb123 RDT is too insensitive a tool to be of programmatic use.

Countries: Haiti

Triple Drug Therapy for LF

Comparison of safety profile and acceptability between triple drug therapy (IVM,DEC,ALB) and standard two-drug therapy (DEC, ALB), plus STH evaluation.

United States of America

Production of a New Dual Antigen Test Strip as a Tool to Support Epidemiologic Assessments of Onchocerciasis

How does the performance of the new Ov16/Ov3261 test strip compare to that of the SD Ov16 RDT and the SD Ov16 ELISA?

Diseases: Onchocerciasis

Development of a geostatistical mapping tool to improve decision-making for Loa loa and LF

Can serological markers for NTDs (particularly Loa loa and Lymphatic filariasis) be incorporated into geostatistical maps and used to guide program decisions around treatment and surveillance?

Testing New RDT Formats to Improve Wb123 Test Sensitivity

To test alternative rapid diagnostic test (RDT) formats for the Wb123 rapid test. In field trials, the current test format was less sensitive that FTS in post-MDA settings whereas alternative Wb123 test formats (ELISA, multiplex) were more sensitive. Our group uses new detection systems, based on nanoshells, to improve RDT performance. 

Brazil

Starworms study

The Starworms project aims to strengthen the monitoring and surveillance of drug efficacy and anthelmintic resistance in soil-transmitted helminth (STH) programs. As such, it will support deworming programs in their quest to eliminate STHs as a public health problem by 2020. The specific objectives are (1) to validate diagnostic tools to monitor drug efficacy and the spread of anthelmintic resistance, (2) to create a surveillance system that monitors the global patterns of drug efficacy and spread of anthelmintic resistance in STH programs, and (3) to develop supporting tools to plan, analyze and follow up on surveys on drug efficacy and the spread of anthelmintic resistance.

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