Use of IP-10 detection in dried plasma spots for latent tuberculosis infection diagnosis in contacts via mail

R. Villar-Hernández, I. Latorre, M. L. De Souza-Galvão, M. A. Jiménez, J. Ruiz-Manzano, J. Pilarte, E. García-García, B. Muriel-Moreno, A. Cantos, N. Altet, J. P. Millet, Y. González-Díaz, I. Molina-Pinargote, C. Prat, M. Ruhwald, J. Domínguez

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2 Citations (Scopus)

Abstract

© 2019, The Author(s). The aim of this study was to test the use of IP-10 detection in dried plasma from contact studies individuals (contacts of smear positive patients), by comparing it with IP-10 and IFN-γ detection in direct plasma, to establish IP-10 detection in DPS as a useful assay for LTBI diagnosis. Whole blood samples were collected from 80 subjects: 12 with active tuberculosis (TB), and 68 from contact studies. The amount of IFN-γ produced by sensitized T cells was determined in direct plasma by QuantiFERON Gold In-Tube test. IP-10 levels were determined in direct and dried plasma by an in-house ELISA. For dried plasma IP-10 determination, two 25 µl plasma drops were dried in Whatman903 filter paper and sent by mail to the laboratory. Regarding TB patients, 100.0%, 91.7% and 75.0% were positive for IFN-γ detection and IP-10 detection in direct and dried plasma, respectively. In contacts, 69.1%, 60.3% and 48.5% had positive results after IFN-γ and IP-10 in direct and dried plasma, respectively. The agreement among in vitro tests was substantial and IP-10 levels in direct and dried plasma were strongly correlated (r = 0.897). In conclusion, IP-10 detection in dried plasma is a simple and safe method that would help improve LTBI management.
Original languageEnglish
Article number3943
JournalScientific Reports
Volume9
DOIs
Publication statusPublished - 1 Dec 2019

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