Evaluation of microscopy, serology, circulating anodic antigen (CAA), and eosinophil counts for the follow-up of migrants with chronic schistosomiasis: a prospective cohort study

Autor: Francesca Tamarozzi, Tamara Ursini, Pytsje T. Hoekstra, Ronaldo Silva, Cecilia Costa, Federico Gobbi, Gerardo B. Monteiro, Leonardo Motta, Govert J. van Dam, Paul L. Corstjens, Lisette van Lieshout, Dora Buonfrate
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Parasites & Vectors, Vol 14, Iss 1, Pp 1-11 (2021)
Druh dokumentu: article
ISSN: 1756-3305
DOI: 10.1186/s13071-021-04655-z
Popis: Abstract Background An accurate test for the diagnosis and post-treatment follow-up of patients with schistosomiasis is needed. We assessed the performance of different laboratory parameters, including the up-converting reporter particle technology lateral flow assay to detect circulating anodic antigen (UCP-LF CAA), for the post-treatment follow-up of schistosomiasis in migrants attending a dedicated outpatient clinic in a non-endemic country. Methods Routine anti-Schistosoma serology results and eosinophil counts were obtained of patients with positive urine/stool microscopy and/or PCR (confirmed cases) or only positive serology (possible cases), and at least one follow-up visit at 6 (T6) or 12 (T12) months after praziquantel treatment. All sera samples were tested with the UCP-LF CAA assay. Results Forty-eight patients were included, 23 confirmed and 25 possible cases. The percentage seropositivity and median antibody titers did not change significantly during follow-up. UCP-LF CAA was positive in 86.9% of confirmed and 20% of possible cases. The percentage positivity and median CAA levels decreased significantly post-treatment, with only two patients having positive CAA levels at T12. Conclusions The UCP-LF CAA assay proved useful for the diagnosis of active infection with Schistosoma spp. and highly valuable for post-treatment monitoring in migrants, encouraging the development of a commercial test.
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