COVID-19 IgG seropositivity and its determinants in occupational groups of varying infection risks in two Andean cities of Ecuador before mass vaccination. - Leon-Rojas, Jose E.; Arias-Erazo, Fernanda; Jiménez-Arias, Patricia; Recalde-Navarrete, Ricardo; Guevara, Angel; Coloma, Josefina; Martin, Miguel; Chis Ster, Irina; Cooper, Philip; Romero-Sandoval, Natalia (PLoS ONE, 2024)