Background: The evolving proportion of the population considered immunologically naive
versus primed for more efficient immune memory response to SARS-CoV-2 has implications …

Importance Estimates of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
disease burden are needed to help guide interventions. Objective To estimate the number of …

Background California has reported the largest number of coronavirus disease 2019
(COVID-19) cases of any US state, with more than 3.5 million confirmed as of March 2021 …

Abstract Background The province of British Columbia (BC) has been recognized for
successful SARS-CoV-2 control, with surveillance data showing amongst the lowest case …

Background Sero-surveillance of severe acute respiratory syndrome coronavirus 2 (SARS-
CoV-2) can reveal trends and differences in subgroups and capture undetected or …

As of August 17, 2021, the US Centers for Disease Control and Prevention (CDC) reported
that 168.7 million people in the US, more than half of the US population, had received full …

Summary Background Population-level SARS-CoV-2 immunological protection is poorly
understood but can guide vaccination and non-pharmaceutical intervention priorities. Our …

The first known case of coronavirus disease 2019 (COVID-19) in Oregon was diagnosed on
February 28, 2020. Through May 31, a total of 4,243 COVID-19 cases in Oregon were …

Background Estimating population prevalence and incidence of prior SARS-CoV-2 infection
is essential to formulate public health recommendations concerning the COVID-19 …

Objectives Seroprevalence studies can provide a measure of SARS-CoV-2 cumulative
incidence, but a better understanding of spike and nucleocapsid (anti-N) antibody dynamics …