loading page

Neutralization of the SARS-CoV-2 coronavirus by hyperimmune serum of llama ( Lama glama) .
  • +11
  • Henri Bailon Calderon,
  • Verónica Yaniro,
  • Silvia Capristano,
  • Miryam Palomino,
  • Juan Lévano,
  • Marco Galarza Perez,
  • David García,
  • Omar Cáceres Rey,
  • Carlos Padilla Rojas,
  • Harrison Montejo,
  • Paquita García,
  • Mary Celis,
  • Silvia Seraylan,
  • Yessica Garayar
Henri Bailon Calderon
Instituto Nacional de Salud

Corresponding Author:[email protected]

Author Profile
Verónica Yaniro
Instituto Nacional de Salud
Author Profile
Silvia Capristano
Instituto Nacional de Salud
Author Profile
Miryam Palomino
Instituto Nacional de Salud
Author Profile
Juan Lévano
Instituto Nacional de Salud
Author Profile
Marco Galarza Perez
Instituto Nacional de Salud
Author Profile
David García
Instituto Nacional de Salud
Author Profile
Omar Cáceres Rey
Instituto Nacional de Salud
Author Profile
Carlos Padilla Rojas
Instituto Nacional de Salud Publica
Author Profile
Harrison Montejo
Instituto Nacional de Salud Publica
Author Profile
Paquita García
Instituto Nacional de Salud
Author Profile
Mary Celis
Instituto Nacional de Salud
Author Profile
Silvia Seraylan
Instituto Nacional de Salud
Author Profile
Yessica Garayar
INSTITUTO NACIONAL DE SALUD , CENTRO NACIONAL DE PRODUCTOS BIOLOGICOS LIMA
Author Profile

Abstract

Since SARS-CoV-2 emerged in China, it has spread rapidly around the world. Effective vaccines and therapeutics for SARS-CoV-2−induced disease (coronavirus disease 2019; COVID19) are urgently needed. In order to assess the immune response to immunization with SARS-CoV-2 and the ability of the immune serum to neutralize the virus infection, we immunized a llama ( Lama glama) with the inactivated SARS-CoV-2 virus, and tested serum samples with an ELISA assay specific to the SARS-CoV-2, and viral neutralization by plaque-reduction neutralization test (PRNT). An increase in seroreactivity was observed for the immunized llama from week 4 onward, revealing seroconversion induced by the immunization, with the highest antibody titers on the 8 th boost. On the reactive serum sample, we performed Western Blot analysis that confirmed the positive ELISA findings, and antibodies from immune serum recognized various viral proteins. The gold standard PRNT showed a visible viral neutralization corresponding with ELISA results. Thus, our findings suggest this llama hyperimmune serum as a possible source of therapeutically antibodies against the SARS-CoV-2 virus infections to evaluate in further studies.