CDC has developed interim guidance for how healthcare providers, laboratories, and public health staff should use antibody tests. These tests look for the presence of antibodies, which are proteins made in response to infections. Antibodies are detected in the blood of people who are tested...

1.5 Million Antibody Tests Show What Parts of N.Y.C. Were Hit Hardest The data from the city is on a far larger scale than previously released information and includes all antibody test results reported to the city’s Department of Health. New York City on Tuesday...