Roche Diagnostics India launches quantitative test to measure antibody levels against SARS-CoV-2

Globally, Roche Diagnostics partnered with Moderna, to utilise the Elecsys Anti-SARS-CoV-2 S antibody test in the mRNA-1273 vaccine research trials

Roche Diagnostics India has launched its antibody test SARS-CoV-2 test – Elecsys Anti-SARS-CoV-2 S. The test is CE IVD approved and has received ICMR and CDSCO approval in India. It is an in vitro test, that quantifies antibodies against the receptor-binding domain (RBD) of spike (S) protein SARS-CoV-2 in human serum and plasma, and determines the body’s immune response to the virus.

As per a company statement, the Elecsys Anti-SARS-CoV-2 S targets antibodies, which are directed against the particular region of the viral spike protein responsible for binding to the host cell receptor, which is required for the virus to enter the host cell. The majority of current vaccines (approved and in development) aim to induce antibody response against the viral spike protein.

Globally, Roche Diagnostics partnered with Moderna, to utilise the Elecsys Anti-SARS-CoV-2 S antibody test in the mRNA-1273 vaccine research trials. The test will help Moderna establish a correlation between vaccine-induced protection and levels of antibodies.

In vaccine trials, before a vaccine is administered it would be beneficial to know the starting level of antibodies a person has, in order to evaluate any change in antibody levels that the vaccine induces, especially the development of antibodies directed against the SARS-CoV-2 spike protein. These antibodies have been shown to have potent antiviral activity and correlate to potential immunity.

Alongside its importance to vaccine efficacy evaluations, the Elecsys Anti-SARS-CoV-2 S serology test can reportedly be used to determine antibody levels in plasmapheresis donations and for estimating seroprevalence.

Giving more details about the test Narendra Varde, Managing Director, Roche Diagnostics India, said that the newest antibody solution, Elecsys Anti-SARS-CoV-2 S will not only give a ‘positive’ or ‘negative’ result, but also will provide a numerical result to indicate the concentration of SARS-CoV-2 specific antibodies in the blood, further supporting the healthcare systems and patients as we jointly fight COVID-19.

Pointing out the need for an antibody test for India Dr Sandeep Sewlikar, Head of Medical & Scientific Affairs, Roche Diagnostics India, stated that the test has both a high clinical specificity of 99.98 per cent (N=5991) and sensitivity of 98.8 per cent (N=1423), 14 days or later after diagnosis with PCR. The result is provided in the form of an antibody concentration (U/mL). According to him, the units of the Elecsys Anti-SARS-CoV-2 S assay have an excellent correlation with and can be considered equivalent to the units of the WHO International Standard.