1.
Emerg Infect Dis
; 27(11): 2878-2881, 2021 11.
Article
in English
| MEDLINE | ID: covidwho-1374225
ABSTRACT
In September 2020, we tested 13,398 persons in Portugal for antibodies against severe acute respiratory syndrome coronavirus 2 by using a quota sample stratified by age and population density. We found a seroprevalence of 2.2%, 3-4 times larger than the official number of cases at the end of the first wave of the pandemic.