Download Covid Antigen Test Kit Negative Pics. The two main branches detect either the presence of the virus or of antibodies produced in response. But it can take days to weeks for these to appear;

Study Finds Nearly Everyone Who Recovers From Covid 19 Makes Coronavirus Antibodies Nih Director S Blog from directorsblog.nih.gov

These tests are designed to detect a specific this may result in false negative tests. The number and types of available tests vary widely based on geographic region and health care facility. Antigen tests use a nasal or throat swab to detect viral proteins expressed on the outer surface of the coronavirus.

For a medical device to be safe to use.

Swab tests can tell whether a person is currently infected, while antibody tests. These tests are new to the market and rely on the detection of viral proteins in swab samples they consist of monoclonal antibodies specific for the viral antigens and results are. False negatives can be an issue. Antigen tests use a nasal or throat swab to detect viral proteins expressed on the outer surface of the coronavirus.