Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A) Partitioned by occupation. B) Partitioned by workstation. C) Partitioned by age group. D) Partitioned by self-reported co-morbidities. E) Partitioned by self-reported COVID-19-like symptoms and work station within the previous 4 months. F) Partitioned by self-reported COVID-19-like symptoms and work station at time or enrolment into the study.
