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?
To assess the programmatic feasibility of and determine the most appropriate age group and sample strategy for an onchocerciasis mapping survey for ivermectin-naïve areas.
The TUMIKIA Project aims to determine whether combining school- and community-based deworming is more effective at controling and eliminating soil-transmitted helminths (STH or intestinal worms) in Kenya than school-based deworming alone.
The two-year trial will provide the drug albendazole to all residents from 150 communities in Kwale County, Kenya. There are three study groups:
- Base: annual school-based deworming (ages 2-14)
- Increased coverage: annual school- and community-based deworming (ages 2-99)
- Increased coverage and frequency: bi-annual school- and community-based deworming (ages 2-99)
TUMIKIA stands for 'Tuangamize Minyoo Kenya Imarisha Afya,' which means “eradicate worms in Kenya to improve health,” in Swahili.
To identify antigens that can be produced as recombinant proteins and to document elimination of schistosomiasis.
To identify antigens that differentiate between infections with Schistosoma mansoni and Schistosoma haematobium and that can be used in an ELISA, lateral flow assay or multiplex format.
Is the multiparallel quantitative polymerase chain reaction technique superior to Kato-Katz microscopy in assessing the intensity and prevalence of soil-transmitted helminth infections in stool?
Preliminary Findings and Lessons Learned
- qPCR was more sensitive than Kato-Katz at detecting Ascaris, Trichuris, and hookworm infections in child fecal samples.
- Very few samples were helminth positive by Kato-Katz microscopy that were not also positive by qPCR, suggesting minimal human classification error during microscopy.
- Duplicate qPCR analysis on ~10% of samples by two separate labs (Smith and KEMRI) showed excellent concordance (97-100% agreement for each helminth species).
- A reanalysis of the effect of a combined water, sanitation, and hand washing (WASH) intervention on child helminth infections with qPCR data compared to Kato-Katz data gave very similar results.