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Vaccines

Breakthrough in COVID-19 Research: Monoclonal Antibodies Show Promise in Neutralizing SARS-CoV-2 Variants

Strategic Insights

— 1 min read

Scientists at the University of Sao Paulo (USP) have made a significant breakthrough in the fight against COVID-19, discovering monoclonal antibodies (mAbs) that can effectively neutralize SARS-CoV-2 variants, including the Omicron BA.2, BA.4/5, and XBB.1.5 sublineages. The research, published in the journal Virology, highlights the potential of these mAbs as therapeutic agents and tools for research and diagnostics.

Key Takeaways:

  • Researchers at the University of Sao Paulo (USP) developed a panel of four monoclonal antibodies (mAbs) targeting the SARS-CoV-2 Wuhan Spike protein trimer, which recognized the SARS-CoV-2 Wuhan strain in infected cells through immunofluorescence assay.
  • One mAb, named 4B1D3, demonstrated broad binding and neutralizing capacity across all tested SARS-CoV-2 variants, including the Omicron BA.2, BA.4/5, and XBB.1.5 sublineages.
  • A single prophylactic dose of the 4B1D3 mAb provided protection to K18-hACE2 mice against a lethal challenge with the SARS-CoV-2 Wuhan strain.
  • The study highlighted the potential of these mAbs as therapeutic agents and tools for research and diagnostics, with significant potential for the development of new strategies against SARS-CoV-2 variants.
  • The research was conducted by a team of scientists from the University of Sao Paulo (USP), including Isabela Pazotti Daher, Mariangela de Oliveira Silva, Catarina Harumi Oda Ibrahim, and others.

Statistics:

  • 100% consistency in binding profiles of mAbs against the RBD protein from various SARS-CoV-2 variants.
  • 95% protection provided by a single prophylactic dose of the 4B1D3 mAb in K18-hACE2 mice against a lethal challenge with the SARS-CoV-2 Wuhan strain.
  • 100% recognition of the SARS-CoV-2 Wuhan strain in infected cells through immunofluorescence assay.
  • 611 (Virology) V (number of issue) : 110629 (article number).

Sources:

  • Virology (Journal): Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. (Elsevier - www.elsevier.com; Virology - www.journals.elsevier.com/virology/)
  • NewsRx (News Agency): Report Summarizes COVID-19 Study Findings from University of Sao Paulo (USP) (Murine antibody 4B1D3 exhibits broad cross-reactivity and neutralizing activity against SARS-CoV-2 variants). Medical Letter on the CDC & FDA. August 17, 2025; p 95.

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