Open AccessUse of IP-10 detection in dried plasma spots for latent tuberculosis infection diagnosis in contacts via mail
Author(s) -
Raquel Villar-Hernández,
Irene Latorre,
María Luiza De Souza-Galvão,
María Ángeles Sánchez Jiménez,
Juan Ruiz-Manzano,
J. Pilarte,
Esther García-García,
Beatriz Muriel-Moreno,
Albert Cantos,
Neus Altet,
Joan Pau Millet,
Yoel D. González-Díaz,
Israel Molina-Pinargote,
Cristina Prat,
Morten Rühwald,
José Domínguez
Publication year - 2019
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-019-40778-1
Subject(s) - latent tuberculosis , tuberculosis , dried blood , medicine , filter paper , immunology , virology , chromatography , mycobacterium tuberculosis , chemistry , pathology
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.