Smith College

STH Diagnostic Comparison: PCR vs. Kato-Katz, Uganda

To determine if a standardized multi-parallel-PCR assay is a more sensitive diagnostic tool for detecting Hookworm (Ancylostoma duodenale and Necator americanus), Trichuris trichiura, Ascaris lumbricoides, Strongyloides stercoralis, and Schistosoma mansoni prevalence compared to the Kato-Katz stool test.

Countries: Cameroon

Impact of Malaria Vector Control & Status of Lymphatic Filariasis Transmission in the Lake Zone of Tanzania

To assess filarial exposure in the study population and mosquito infection status prior to and after the start of intensified malaria control interventions.

Countries: Tanzania

Laboratory analysis of Ov16 ELISA and Skin snip PCR to support surveillance activities in National programs. Multi-country comparison of diagnostic tools to detect Onchocerca volvulus.

To compare the performance of the diagnostic tools currently available for O. volvulus in terms of their relative sensitivity, species-specificity and practical use by countries.  Comparison of the utility of these tools for mapping and surveillance in settings with different levels of endemicity for onchocerciasis (Oncho), lymphatic filariasis (LF) and/or loiasis.

Countries: Burkina Faso
Diseases: Onchocerciasis

Mapping LF-Loa Coendemicity in South Sudan

Mapping LF-Loa Coendemicity in South Sudan

Countries: South Sudan

Mapping LF-Loa Coendemicity in Angola

Mapping LF-Loa Coendemity

Countries: Angola

Mapping LF-Loa Coendemicity in Chad

Mapping LF-Loa Coendemicity

Countries: Chad

Comparison of Kato-Katz and PCR for STH

To compare the sensitivity of double-slide Kato-Katz and multi-parallel real-time polymerase chain reaction (PCR) in the detection of Ascaris, hookworm, and Trichuris infection among children in rural Bangladesh

Countries: Bangladesh

Comparison of muti-parallel qPCR and Kato-Katz for detection of STH in Kenyan children

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.
Countries: Kenya

Defining the Profile of LF Antibody Reactivity following MDA

Determine age-specific prevalence of LF Antibody following MDA to inform surveillance strategies.

Countries: French Polynesia