More SARS-CoV-2 antibodies and antigens

New SARS-CoV-2 antigens

SARS-CoV-2 antigens

We are now able to provide a wider selection of SARS-CoV-2 recombinant antigens to support the IVD test manufacturers. These antigens are produced in mammalian CHO cells, thus providing excellent performance and allowing post-translational modifications, such as glycosylation and phosphorylation. They can be used with Medix Biochemica’s well validated anti-IgG, anti-IgM, and anti-IgA antibodies in serological testing to detect SARS-CoV-2 antibodies from blood samples.

Ordering information

Recombinant SARS-CoV-2 antigens:

  • Nucleocapsid (N)

100 µg, 710081
1 mg, 710082
5 mg, 710083

  • Spike S1

100 µg, 710090
1 mg, 710091
5 mg, 710092

  • Spike RBD 1 (aa 331-524)

100 µg, 710093
1 mg, 710094
5 mg, 710095

  • Spike RBD 2 (aa 319-541)

100 µg, 710096
1 mg, 710097
5 mg, 710098

Serological anti-human IgG, IgM, and IgA antibodies

Rapid detection of anti-IgG, anti-IgM, and anti-IgA antibodies will add value to the diagnosis and treatment of COVID-19 disease, as well as to epidemiological studies on the prevalence of the disease in a population. It has been shown that IgM and IgA become detectable around 1-5 days after onset of symptoms, whereas IgG becomes detectable later, approximately after 8 days.

According to the latest study findings, the IgA response appears and grows early, peaks at week 3 and is even more persistent than the IgM response in Covid-19 patients.

IgA-Ab response to spike glycoprotein of SARS-CoV-2 in patients with COVID-19.
Ref: Padoan, et al. IgA-Ab response to spike glycoprotein of SARS-CoV-2 in patients with COVID-19: A longitudinal study. Clin Chim Acta (2020) 507:164-166.

Please see details of Medix Biochemica’s mouse IgG antibodies specific to human IgG, IgM, and IgA:

Lee Biosolutions products

In addition, we support Covid-19 related test development by providing native control proteins and biological specimens, including:

  • Control material proteins for IgG, IgM and IgA
  • Rheumatoid Factor concentrate used in interference studies
  • Biological products including confirmed COVID-19 positive serum

Please visit to find more information about these products.