LONDON – Getting a handle on the specificity and sensitivity of rapid COVID-19 antibody tests, how they compare to each other and how they should be applied in population screening to understand who has had the virus and how it has spread, has been a source of difficulty and dispute between manufacturers, clinicians and public health experts.
Diagnostic manufacturers are turning their attention to antibodies for those who have been vaccinated for the SARS-CoV-2 virus, and the U.S. FDA’s Tim Stenzel had some advice about this on the Feb. 10 testing town hall. Stenzel advised that developers think of such tests in the same vein as a companion diagnostic (CDx) in that these antibody test will have to be separately validated for each vaccine that is included in the test’s labeled claims.
The U.S. FDA has granted emergency use authorization (EUA) to Quanterix Corp.’s SARS-CoV-2 IgG antibody test, which tests blood samples for evidence of recent or prior COVID-19 infection. The test could also be used to measure antibody response to a COVID-19 vaccine. The Simoa Semi-Quantitative SARS-CoV-2 IgG antibody test is indicated for the qualitative and semi-quantitative detection of IgG antibodies to SARS-CoV-2 in human serum and dipotassium EDTA plasma from a venous blood draw.
Roche Holding AG has revealed a partnership with Moderna Inc. involving the use of the Elecsys Anti-SARS-CoV-2 S antibody test in the latter’s mRNA-1273 vaccine research trials. The news comes shortly after Roche received emergency use authorization from the U.S. FDA for the antibody test.