![]() ![]() Also shown are the percentages of participants who tested positive stratified according to sex in the targeted-testing group (Panel D) and in the population-screening group (Panel E). Shown is the distribution according to age and sex among all the participants in the study who were targeted for testing for the presence of SARS-CoV-2 (Panel A), among those who participated in the open invitation of the population screening (Panel B), and among those who participated in the random sample (Panel C). (Funded by deCODE Genetics-Amgen.).Ĭopyright © 2020 Massachusetts Medical Society. The proportion of infected persons identified through population screening did not change substantially during the screening period, which was consistent with a beneficial effect of containment efforts. In a population-based study in Iceland, children under 10 years of age and females had a lower incidence of SARS-CoV-2 infection than adolescents or adults and males. The percentage of infected participants that was determined through population screening remained stable for the 20-day duration of screening. The haplotypes of the sequenced SARS-CoV-2 viruses were diverse and changed over time. 16.7%) and in population screening (0.6% vs. Fewer females than males received positive results both in targeted testing (11.0% vs. Children under 10 years of age were less likely to receive a positive result than were persons 10 years of age or older, with percentages of 6.7% and 13.7%, respectively, for targeted testing in the population screening, no child under 10 years of age had a positive result, as compared with 0.8% of those 10 years of age or older. Most persons in the targeted-testing group who received positive tests early in the study had recently traveled internationally, in contrast to those who tested positive later in the study. In total, 6% of the population was screened. Of those tested in the general population, 87 (0.8%) in the open-invitation screening and 13 (0.6%) in the random-population screening tested positive for the virus. We sequenced SARS-CoV-2 from 643 samples.Īs of April 4, a total of 1221 of 9199 persons (13.3%) who were recruited for targeted testing had positive results for infection with SARS-CoV-2. We also carried out population screening using two strategies: issuing an open invitation to 10,797 persons and sending random invitations to 2283 persons. We targeted testing to persons living in Iceland who were at high risk for infection (mainly those who were symptomatic, had recently traveled to high-risk countries, or had contact with infected persons). However, data are limited on how SARS-CoV-2, the virus that causes Covid-19, enters and spreads in a population. During the current worldwide pandemic, coronavirus disease 2019 (Covid-19) was first diagnosed in Iceland at the end of February. ![]()
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