Pre-existing T-cell immunity to SARS-CoV-2 in unexposed healthy controls in Ecuador, as detected with a COVID-19 Interferon-Gamma Release Assay

by Gustavo Echeverría, Ángel Guevara, Josefina Coloma, Alison Mera Ruiz, María Mercedes Vasquez, Eduardo Tejera, Jacobus H. de Waard
Published 2021-04-01