Seroprevalence of antibodies to SARS-CoV-2 in Six Sites in the United States, March 23-May 3, 2020pdf iconexternal icon.Learn about the limitations of this survey and how to interpret these serology results.CDC has received results from the Western Washington State region; the New York City metro region; south Florida; and all of Connecticut, Missouri, and Utah from blood samples collected by commercial laboratories as part of routine patient care.As more data become available, tables and data charts will be added to this page to show the early antibody test results for patient specimens tested in these areas.Cases Reported in that catchment area by April 1, 2020Estimated Cases based on Seroprevalence and catchment area populationDifference.