Diagnosis of Schistosomiasis without a Microscope: Evaluating Circulating Antigen (CCA, CAA) and DNA Detection Methods on Banked Samples of a Community-Based Survey from DR Congo
Tropical Medicine and Infectious Disease, vol. 7, pp. 315
Abstract
Detection of Schistosoma eggs in stool or urine is known for its low sensitivity in diagnosing light infections. Alternative diagnostics with better sensitivity while remaining highly specific, such as real-time PCR and circulating antigen detection, are progressively used as complementary diagnostic procedures but have not yet replaced microscopy. This study evaluates these alternative methods for the detection of Schistosoma infections in the absence of microscopy. Schistosomiasis presence was determined retrospectively in 314 banked stool and urine samples, available from a previous survey on the prevalence of taeniasis in a community in the Democratic Republic of the Congo, using real-time PCR, the point-of-care circulating cathodic antigen (POC-CCA) test, as well as the up-converting particle lateral flow circulating anodic antigen (UCP-LF CAA) test. Schistosoma DNA was present in urine (3%) and stool (28%) samples, while CCA (28%) and CAA (69%) were detected in urine. Further analysis of the generated data indicated stool-based PCR and the POC-CCA test to be suitable diagnostics for screening of S. mansoni infections, even in the absence of microscopy. A substantial proportion (60%) of the 215 CAA-positive cases showed low antigen concentrations, suggesting that even PCR and POC-CCA underestimated the “true” number of schistosome positives.
Authors 9
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Pytsje T. Hoekstra corresponding Aachen Department of Parasitology, Leiden University Medical Center
Leiden University Medical Center
Affiliation as printed
Department of Parasitology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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Instituut voor Tropische Geneeskunde · UCLouvain
Affiliation as printed
Department of Biomedical Sciences, Institute of Tropical Medicine, 2000 Antwerp, Belgium
Institute of Health and Society, Université Catholique de Louvain, 1348 Brussels, Belgium
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University of Kinshasa · National Institute of Biomedical Research
Affiliation as printed
Department of Tropical Medicine, University of Kinshasa, Kinshasa 7948, Democratic Republic of the Congo
Institut National de Recherche Biomédicale, Kinshasa 1197, Democratic Republic of the Congo
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Leiden University Medical Center
Affiliation as printed
Department of Clinical Microbiology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Parasitology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Cell and Chemical Biology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Parasitology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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Instituut voor Tropische Geneeskunde · Vrije Universiteit Amsterdam
Affiliation as printed
Department of Biomedical Sciences, Institute of Tropical Medicine, 2000 Antwerp, Belgium
Department of Health Sciences, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Parasitology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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