Int. j. infect. dis | 2021
Absence of SARS-CoV-2 antibodies in pre-pandemic plasma from children and adults in Vietnam
Abstract
We tested pre-pandemic (2015-2019) plasma samples from 148 Vietnamese children, and 100 Vietnamese adults at high risk of zoonotic infections, for antibodies against SARS-CoV-2 nucleocapsid and spike proteins. None was positive, indicating no prior serological cross-reactivity with SARS-CoV-2 that might explain the low numbers of COVID-19 in Vietnam.